videoediting

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Jul 12, 2015
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Hello,
I want to backup some files (windows 7 pc) using windows backup.
I 'd like to know if windows backup changes the backup file when the original is changed or if it just copies the new one without deleting the old one.
It is very important because my backup drive is not much bigger than the documents I want to backup so I do not want to waste space.
Thank you
 

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