Best Cloud Backup Services 2018

Best Cloud Backup Service

Disasters happen. If your computer is stolen or destroyed in a flood or fire, or your hard drive unexpectedly fails (and it will), it's important to have a backup that can quickly restore all your important photos and files. Online backup services are an inexpensive way to give you some peace of mind, as they can save the contents of your computer to the cloud.


Based on our extensive testing of five services, the best online backup option is  Backblaze ($50/year on Backblaze) . We had originally preferred CrashPlan, but in August 2017, CrashPlan announced its departure from the consumer online-backup market.

Backblaze had been a close runner-up to CrashPlan, with the main difference being that CrashPlan offered unlimited deleted-file protection while Backblaze's similar protection extended back only 30 days. We had no hesitation in making Backblaze our Editor's Choice after CrashPlan's exit.

Online Backup vs. Online Syncing

Online-backup services are different from online-syncing services such as Dropbox, Google Drive or Box. That's because online-backup services  continually save a copy of every personal file on your computer to a safe offsite data center; syncing services copy only items in designated folders with the aim of distributing clones of those items to your other computers and mobile devices.

Additionally, online-syncing services have relatively low upper limits on capacity, unless you pay a lot. Online-backup solutions, in contrast, often offer unlimited storage, letting you back up all the personal files on your computer — and sometimes even files on external drives — for one flat, fairly low fee.

The data-traffic flow is different as well. A syncing service like Dropbox uploads file changes from your computer to its servers, then broadcasts the file updates to your other machines. With an online-backup service, the data also goes initially from your computer to the server, but then the data just sits and stays there. Only when you need to restore a drive or machine does data flow back to you.

What Gets Backed Up, and What Doesn't

In general, online-backup services make copies only of user folders and other files designated as personal or "user-generated." They don't  normally back up operating systems or application software. If you're completely reliant on online-backup services, you'd better have software-installation disks or installer files handy, as well as license keys, if your system gets hopelessly corrupted or the hard drive dies.

Local backup software, which most online-backup services also offer to complement their primary products, can create disk "images" that back up everything on a computer, including application and system software, so that a clone can easily be created on a new disk or a new machine. Acronis started out making imaging software, then expanded into cloud-backup software.

How We Tested and Rated

Our testing and analysis focused on three main areas: ease of file restoration, computer-resource usage and the cost-to-storage ratio. These are essential features when looking for an online backup service, since most services will install an application meant to constantly run on your computer.

Other aspects were also taken into consideration, such as data-transfer speeds, user interface, ease of installation and any unique features.

We didn't weigh transfer speeds that heavily, because upload speed is only relevant during your initial upload, which typically takes a couple of days to an entire week. After the initial upload is complete, only new or revised files are backed up on a continuous or regular basis, and you'll barely notice it.

For our testing, we sequentially installed and tested five backup services on a MacBook Air: CrashPlan, Backblaze, IDrive, Acronis True Image and Carbonite. We used each service to back up a 4.96-GB folder, containing images, video and music, to the cloud — with Acronis being the only exception, since it then supported only full-disk backups. After a service's backup was complete, we then restored a large movie file before moving on to testing the next service.

Metrics such as upload and download speed, as well as computer usage, were measured using two OS X applications: Little Snitch 3.5.1 and OS X's Activity Monitor. All tests were run between the hours of 9 a.m. and 8 p.m. on Optimum's Online Ultra 50 (up to 50 Mbps down and 25 Mbps up) home Internet service in Brooklyn, New York. It should be noted that download and upload speeds rarely come close to those upper limits.

Backblaze — Editors' Choice

Ease of file restoration: Fast and easy, can be done only from the Backblaze website
Computer resource usage: Insignificant resource usage
Cost to storage size ratio: Excellent: unlimited storage (including external drives) for $5 per month (or $50 per year)

Backblaze is small, sleek and offers all the features that you'd expect from an online-backup service. It's also the least expensive option available, costing just $5 per month (or $50 per year) for unlimited online storage for one PC or Mac, including backups of external drives. (Backblaze offers no family plan or other discount for multiple machines.)

After registering for an account, I downloaded the Backblaze installer, which set up a System Preference pane rather than a stand-alone application. The Backblaze preference pane offered just the essential information: the ability to back up now, options for restoration and settings.

The entire Macintosh HD was selected for backup by default, although certain folders and file types were automatically excluded — including the Application and System folders, and .DMG (installation) and .SYS (system) files. These omissions make sense for most people, and each can be overridden by adjusting the app's settings.

The initial upload to Backblaze was slower than that of other services we tested, averaging about 0.7 Mbps when measured with Little Snitch. Speeds did sometimes jump to 4.1 Mbps (Backblaze does not display the current transfer rate). These upload speeds were confirmed using Backblaze's own speed-test tool to estimate a user's total upload time, but the speeds fell shy of the 2.9-Mbps uploads-speed average. (Since this review was first published, Backblaze has updated the upload protocol for improved speed.)

Restoring files can be done only through the Backblaze web interface. Once I selected a movie file to restore, I had to wait approximately one minute for the download to be ready; when it was ready, I was notified by email. Download speeds for that restoration averaged 4 Mbps, which is pretty close to the 4.2-Mbps average for all the services we tested.

For larger restorations, Backblaze offers two different services, depending on the size of the desired restoration. For $99, Backblaze will mail you a USB flash drive that can hold up to 128 GB of files; for $189, you can get an external hard drive that holds up to 4 TB of data. Backblaze gives  users the option of keeping the storage drives after the restoration process is done, or returning them within 30 days for a full refund via the Restore Return Refund program. (Customers pay for the return shipping.)

File encryption in Backblaze starts on your personal computer, with all your documents being locked with a 128-bit AES symmetric key and transferred over a secure SSL connection. Additionally, you can add your own password to protect your data even further, providing an additional level of protection to your files. There's also a two-factor verification option for even greater security.

Blackblaze offers continuous file backup, which means the application will switch between scanning for new files and uploading them. According to Backblaze, for most computers "this results in roughly one backup per hour." Scans use very little in system resources, and the application was rarely distinguishable in my Mac's Activity Monitor.

Unlike Acronis or Carbonite, Backblaze doesn't make local-backup software. But its website does have a very good, thorough guide to performing all kinds of backups that shows you how to use built-in Windows and Mac software for local backups.

Backblaze has a companion mobile app for iOS and Android, but it leaves a lot to be desired. The biggest frustration for me was that I had to input my email and password every time I launched the application. (However, the mobile app can now sign you in automatically, and has added support for Apple's Touch ID fingerprint reader.) Additionally, the app doesn't allow you to download files greater than 30 megabytes, so you'll need your computer to restore anything bigger than a forgotten document or presentation.

If you've accidentally deleted a file, you have 30 days to restore it from Backblaze before it's permanently deleted from the company's servers. Backblaze's versioning system likewise has a 30-day time limit.

Bottom Line

Backblaze is a slim and lightweight online backup service that definitely won't break the bank. The dead-simple application means that you'll be starting your initial backup in no time, and file restorations can be done from any computer using the Web interface.


Ease of file restoration: Fast and easy, from either the iDrive application or website
Computer resource usage:
Insignificant resource usage
Cost to storage size ratio:
Fairly expensive: $70 per year for 2 TB, but for unlimited machines

Like Acronis, IDrive charges according to the amount of storage used rather than charging a flat fee for unlimited storage space. Aside from its free 5GB plan — which makes it more like a Dropbox competitor than an online backup solution — the cheapest IDrive option offers 2 terabytes of storage for $70 per year, although you'll get a hefty discount for the first year. The next tier up is 5TB for $100 per year.

There's a good chance that 2TB of storage space will be more than enough for all your important files — at least initially. Furthermore, IDrive allows backups of an unlimited number of devices, be they PCs, Macs, external drives or smartphones (see below).

The catch is that IDrive doesn't remove deleted files from storage. This is a bonus when you have unlimited storage space, but otherwise, the deleted files can quickly add up and require maintenance to keep the overall used space below that 2TB limit.

The IDrive application is fairly straightforward, allowing users to select which folders in their Macintosh HD directory they want to back up. I observed transfer rates of around 4 Mbps during the backup, despite the application only displaying a 1.5-Mbps upload rate, which means files were actually transferring more quickly than the application showed. The average speed of all the services we tested was 2.9 Mbps, so IDrive was definitely faster.

Likewise, restoration downloads transferred at around 7 Mbps, while the application showed a download rate of only 4.5 Mbps. Both these rates are faster than the 4.2-Mbps average.

Like Backblaze, IDrive offers a service, in this case called IDrive Express, that ships you a physical hard drive containing up to 3TB for large restorations. If you're a paying subscriber, this can be done for free once per year, and costs $60 each time otherwise. There's also a versioning feature called IDrive Rewind, which dials back any file or batch of files to a previous version.

IDrive certainly doesn't skimp on security, offering 256-bit AES encryption with the option to generate your own private key during signup. This means your files are very safe and secure. A journaling system called IDrive Snapshots was introduced in July 2017 and lets victims of encrypting ransomware, whose most recent backups may also have been encrypted, dial back the clock to an earlier safe backup.

The IDrive mobile app, available for iOS, Android and Windows Phone, works a little differently from the competitors' apps. In addition to allowing users to restore and share backed-up files, you can choose to back up the contents of your phone to your IDrive account. When this is enabled, the IDrive app will automatically upload new images, photos, calendar events and contacts to your cloud-storage account.

For customers in the U.S., IDrive also offers a wireless networked storage drive called the IDrive One that complements the cloud backup with local backup. (You can also use the IDrive software to make local incremental backups or full-disk images on any external drive.) IDrive One cost $80 for a 1TB drive or a 128GB SSD, and $100 for a 2TB drive or a 256GB SSD. Users of IDrive's free cloud-backup service who purchase an IDrive One will get 1TB of cloud storage gratis for the first year.

I enabled phone backup by flipping a switch in the app, and my photos and videos immediately began uploading to my IDrive account. These files were immediately available through the IDrive website, and I restored a couple of images to my laptop.

IDrive was easy to use, but the lack of unlimited storage means you'll need to monitor the service from time to time and possibly remove old files if you ever get close to your storage limit.

Acronis True Image

Ease of file restoration: File restoration easy from website, full-disk restoration requires empty storage drive
Computer resource usage:
Insignificant resource usage
Cost to storage size ratio:
Expensive: plans vary, but it's $100 for a year of 1TB cloud storage for 1 computer ($8.33/month)

Acronis True Image is slightly different from the other online-backup services we tested. It offers a full system-image backup rather than a backup of simply user files and folders. Applications, files, user accounts, configurations and even the operating system are stored in one compressed file, both locally and in the cloud, although incremental backups are also offered.

The Acronis software is initially inexpensive, at $50 for a one-time purchase for a single PC or Mac. (For 2018, Acronis has renamed this the Standard edition.) But the price can ratchet up quickly depending on your needs.

To get 250GB of cloud backup storage — not much these days — you'll need a subscription to the Advanced edition, for $50 per year for one machine. For three machines, it's $80 per year, and for five, it's $100. (With a cloud subscription, you'll get the local backup software at no extra charge.) Additional storage up to 500GB can be purchased in-app.

For 2018, a third tier has been added. Called Premium, it includes 1TB of cloud storage as well as blockchain technology and electronic signatures to verify data, two features that may be more useful for business customers than for consumers. (Acronis offers a myriad of business services.) Premium is $100 for a single machine, $150 for three and $160 for five. Again, you can buy more storage in the application, but Premium's top limit is 5TB.

Befitting Acronis True Image's origins as a strictly local solution, the software can be used to make a backup file to any location, including your own external hard drive, as well to a cloud server. This makes possible the optimal backup situation: simultaneous backups to both local and cloud storage. You can even clone a drive while it's being used. An unlimited number of mobile devices can be backed up as well, but there's no cloud backup offered for external hard drives that aren't used as backup drives.

In 2017, Acronis added ransomware protection to True Image, as well as two more esoteric features: Acronis Notary, which verifies the content of a backed-up file against the original version, and Acronis ASign, which lets multiple users certify a file with digital signatures. The 2018 edition added a Security Dashboard and what it calls Acronis Active Protection, which stops ransomware encryption and restores encrypted files from backup.

We selected Acronis' cloud backup service and downloaded the backup and restoration software. Creating a new backup was extremely simple: We just selected our hard drive as the source and then the Acronis Cloud as the destination. (The application was already linked to our account upon installation.)

Upload speeds were fast, around 5 Mbps compared to the 2.9Mbps average. Acronis has finally moved on from its full-disk-only backups, and now supports backups of only user-designated files and folders if that's what you'd prefer. In order to restore a full disk, you need an empty external drive on which to store the bootable restore file.

Individual files can be accessed through the Acronis web interface, which looks a lot like Dropbox, but can access all your computer's files rather than only documents in your Dropbox folder. Our restoration download speeds averaged around 4.5 Mbps, which was slightly higher than the category average (4.2 Mbps).

Acronis offers unlimited deleted-file protection, although the default setting, which users can change, clears out the file after 30 days.

The Acronis mobile app (iOS and Android) is fairly standard. I used it to restore an image and send it to a friend via email. I browsed through my backup to the desired file directory, clicked on the file to download, and was able to view and share the image as soon as it was downloaded. Unlike the Backblaze mobile app, there is no size restriction on file downloads.

When we first reviewed Acronis, it did not support continuous file backup, and was instead set to a daily backup schedule by default, with the alternate options being weekly or monthly. For the 2018 edition, continuous file backup was introduced.

Additionally, the built-in 256-bit AES encryption is not enabled by default, and must be turned on before the initial backup. We performed our first backup before noticing this setting, and had to perform an entirely new full-disk backup to enable file encryption.


Ease of file restoration: File restoration easy from application or website
Computer resource usage:
Insignificant resource usage
Cost to storage size ratio:
Good, starting at $60/year for unlimited storage space

Carbonite offers three different personal subscription plans. The cheapest is the Safe Basic plan at $60 per year for one computer, followed by the Safe Plus plan at $99 per year and the Safe Prime plan at $150 per year. There's no discount for multiple computers -- adding another machine to each of these plans doubles the initial price -- but there's a small one for multi-year subscriptions.

We tested the Basic plan, which at the time was the only plan available to Mac users, and did not -- and still does not -- include backups of external drives, backups to local drives, or (strangely) automatic video backup. (More on that later.)

The Carbonite application is more like an FTP program compared to its competitors, as it allows you to browse every file on your computer, whether that file is selected for backup or not. The application displays a little icon next to every file that represents the file's status, such as Backed Up, Recoverable or Not Selected for Backup.

All backup files are protected by a 128-bit encryption key, just as with Backblaze. But unlike Backblaze, Carbonite has no option to add your own personal password. The 128-bit encryption, which uses the Blowfish cipher, is secure, but it would have been nice to add another layer of security.

Despite average initial backup speeds of around 1.5 Mbps, slower than the 2.9-Mbps average, the full backup was significantly faster than those of Carbonite's competitors. The total size of the files uploaded was also significantly lower than with every other service. Digging into these discrepancies, I realized that this was because neither the Basic nor the Plus plan included automatic video file backup. Only the Prime plan offered this feature. (Since this review was written, Plus has added automatic video backup.)

In order to select video files for backup, I needed to navigate to each file's respective folder from within the Carbonite application, select the file and click Back This Up. The Basic version of the application does not allow you to select more than one file at a time, so this was a tedious process for the multiple video files I was uploading.

We reached out to Carbonite for comment, since it was the only online backup service we tested that had this limitation.

"We include automatic video backup in our Prime subscription and make it optional (or manual) in our Basic and Plus offerings," a company spokesman told me. "This approach enables us to keep the price of Basic and Plus lower, making reliable data protection accessible to a wider range of people. And, although it is not an automated process, Basic and Plus customers can backup video files using our standard user interface."

Like most cloud-backup services, Carbonite backs up only "user-generated" files such as music, documents, photos or email messages, not a computer's operating system or third-party software. To back up everything, you'll need a Prime plan, which lets Windows users back up disk images to external local drives.

Carbonite also offers a service that ships an external drive containing all of your files to U.S. residents. Prime users pay only $10 per use, standard shipping included, but Basic and Plus users will pay $99 each time. You'll be charged an extra $130 if you don't send back the drive within 30 days.

Restorations through the Carbonite application were also fairly slow, averaging a transfer rate of around 1 Mbps, compared to 4.2Mbps for the category average. Neither the backup or restore progress bars accurately displayed either process's progress, either — both stayed completely empty, despite file-download progress observed by the Little Snitch network monitor, before jumping to fully complete when the file transfer was done.

Carbonite says that this is because the progress bars fill by adding only fully completed files, rather than blocks of data, and that the company is currently working on a more detailed transfer status bar. (After this review was originally published in March 2015, the status bar was updated to show incremental progress.)

The Carbonite mobile app, available for iOS and Android, allows users to access their backed-up files on the go. I was able to easily download and email a PDF file that was part of my computer backup, but I was only able to view, not share, a larger video file that I attempted to restore. (In March 2015, Carbonite raised the size limit on downloadable files from 1GB to 10GB.)

Like the other services we tested, Carbonite offers deleted-file protection, but like Backblaze, it deletes the file after 30 days. Windows users can use a version-history feature to roll back files to any point within the past three months.

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  • MikhailCompo
    CrashPlan used to be one of the few Online Backup solutions that allowed backup from a Windows Server but they have recently ceased supporting any server OS. This leaves quite a large gap that many like myself, will be looking for a solution.

    There is no mention of what OS's are supported in this article, which would be usedful.

    People interested in Carbonite might want to read these articles too:
  • Aleksander_12
    Do u know maybe Xoperos solutions? I started use their product. Actually i am satisfied , but tell me if u know more backup solutions (for small company) or maybe you have some experience with Xopero too?
  • Tomascco
    You do have to monitor your data usage with iDrive, but even then you have no idea how or what they are backing up. I made it easy: I have a one terabyte server and a one terabyte data plan. Simply mirror my server.

    Within 30 days I had backed up one quadrabyte of data, according to iDrive. How is that possible? Well, they were as perplexed as I was. I had over $4,000 of disputed overage charges.

    I'm starting to get overage warnings, again on a one terabyte server with an equal data plan. The difference this time is that I am not hearing a peep out of customer service.

    Apparently, they are spending money on marketing rather than customer support, because there is an overabundance of the former and not a sign of the latter.
  • pockets1026
    Beware iDrive - Subscribed to their backup service for 4-5 years, but haven't really utilized it the past year. When I got 3 emails over the past 3 months saying that iDrive didn't have my updated card information and therefore my account would not auto-renew and cancel, I thought it was time anyway and didn't respond with my new info. Since they didn't hear from me, they went to my bank instead, paid to get my updated card information, and ran the transaction anyway, with no notice, email, or call to let me know that the issue they'd emailed about several times had been resolved and that my account had renewed. By the time I caught the charge on my bank statement two weeks later and called iDrive to cancel my account/get refunded for the year of service that I wasn't going to use, they refused my refund request, cancelled my account, and kept the $150 that I paid for the next year of service.
  • visibone
    I don't get the big difference between CrashPlan Home and CrashPlan for Small Business. Why didn't you just switch to recommending CrashPlan for Small Business?

    (I admit to being annoyed by many of these attempts by companies to "silo" their customers into different vertical markets. Usually I feel as if I belong to all or none of their categories. I work at home and the lines between personal and business are blurry.)
  • georgw1978
    Once it's about CrashPlan Home Family plan (what I and my family have been using since 6 years with at least 5 devices and +5TB archived data), CP for SB isn't really an option. Nor are most of the services discussed here.
    Only IDrive looks quite reasonable to me, not unlimited though, but the regular price for 5TB per year and unlimited devices is $99,50. Right now they have a great offer for CP Home users (5TB for $6,95 in first year).
  • macdowellj22
    I have personally used cloudbacko for domino backup and i am satisfied with their service.They also backups for sql, cloud and vmware. While opting for a good online data backup service, you should be first clear what you want and how you want them to cater it.
  • tompijls
    Looking for an alternative for Crashplan.
    Started looking at Backblaze.
    Seems they don’t have Mac users in mind.
    I’ve an external drive, which also hosts a Time Machine backup. Backblaze will not allow you to backup this drive.

    Only way to get around is is to partition my drive, and put the time machine backup on a separate partition… Really ??? My guess is that about 99% of mac users use time machine on an external drive… Do you really want your customers to establish workarounds (like repartitioning drives) for what is clearly a feature limitation in your backup software?
  • erikaray247
    I am using google one drive 15gb free services.
  • rlsmd
    Question from rlsmd : "SkyVault360 Backup System"

    I just read your discussion of backup systems for 2017. Have you looked at the SkyVault360 backup system? I would be interested in your comments on it.
  • smithj33
    If Crashplan was so good, why stop recommending it? Anyone can still use it, but now it's $10/mo.
  • slythdreams
    I have had nothing but trouble out of iDrive. I switched to them after Crashplan said they would no longer be doing personal accounts (or however they worded it). I won't be renewing. Every few weeks, I keep getting an error that iDrive hasn't backed up for seven days. The first time it happened, I sent them the report, they told me I needed to update iDrive. Okay... so I did. The next time, they told my computer had been left off. This last time, I'm back to needing to update it again. When I try to update it via the iDrive tray, I get the message that the latest version is installed.
  • 11201ny
    These services are unreliable... i'm really surprised you guys don't have a better list. Backblaze makes promises they can't keep.

    After 6 months of backing up to Backblaze, I now use Arq + Amazon Cloud Drive. I have so far referred to older snapshots of my backups many times, as files go corrupt. It's reliable.
  • stingley
    I have to chime in and just report what a horrible experience IDrive was for me. I signed up 2 weeks ago and installed on my Windows 10 machine. Windows 10 has been rock solid for me for a year now... until I installed IDrive. It crashes 2-3 times a day - freezes and then the Win 10 crash screen where it does its memory dump and then reboots. I started an email thread with tech support. The first thing they asked for was a screen shot. Ok this tells me right out of the gate I'm not getting the A team of tech support. Obviously I don't have screen shots of crashes. I sent the minidump file to them and they then asked me to try installing on another computer. This is like asking a mechanic why the car keeps dying and he says well try a different car.
    I'll be giving BackBlaze a try now.
  • 11201ny
    It seems like these articles are all paid for by the companies that are well rated. Surprising from Tom's. The way to rate ALL of these services is not by touted specs, but by actual stories of success, especially for those with huge archives. I have personally read horror stories about both Backbalze & Crashplan. So either it's 100% reliable, durable - or it's 0%. 99% reliable = unreliable.

    I have a 10TB archive that is safe and sound on ACD, using incremental backups through Arq Backup. Before that i was just using Backblaze. As great as BB looks - and they look solid, I wasn't able to get through a single backup after 4 months of continuous uploading over a cable line with 20/mbps upload speed. So I started reading stories about Backblaze, and their failures - which made me pull the plug, and switch.

    With a lot of theses companies, it's all branding, or it's all specs on paper. However with a last line of resort, such as cloud back up services, reliability & durability have to be 100%.
  • stingley
    Thanks for all the great reviews you do here! So helpful.
    I have to chime in and just report what a horrible experience IDrive was for me. I signed up 2 weeks ago and installed on my Windows 10 machine. Windows 10 has been rock solid for me for a year now... until I installed IDrive. It crashes 2-3 times a day - freezes and then the Win 10 crash screen where it does its memory dump and then reboots. I started an email thread with tech support. The first thing they asked for was a screen shot. Ok this tells me right out of the gate I'm not getting the A team of tech support. Obviously I don't have screen shots of crashes. I sent the minidump file to them and they then asked me to try installing on another computer. This is like asking a mechanic why the car keeps dying and he says well try a different car.
    I'll be giving BackBlaze a try now.
  • ledsales12
    I used Backblaze for a couple of years and there were regular problems, such as the app crashing, or simply refusing to run, or backups simply stopped uploading but it wouldn't tell you there was an issue, it was a generally horrible experience.

    Currently I use Degoo as they have a 100GB free plan, but their app is also a tad glitchy and never seems to complete all folders to 100%, even with no changes happening in those folders.

    Mega is my backup backup, 50GB free, but is really too small.

    Would be happy to pay for a service if any of them actually worked as promised, but from the many forums and comment posts, none of the common services, paid or otherwise, work properly without issues. There's no point having a backup system if it simply stops working and you don't discover this until you need to recover a file!

    Seems there is a hole in the market for a decently priced, reliable system without all the server login glitches and app problems, if someone can actually come up with that, they will have plenty of customers...
  • Darkon112
    What do you all think of Arq and any cloud drive you want to use, like Amazon's Cloud Drive backup ($60.yr)? If you need a lot more space than that you can also use Amazon's Glacier for example... Anyway, it seems more flexible than other providers (idrive,backblaze, etc.)
  • actsean
    Has anyone tried Nordic Backup?