Best free backup software

My parents have a vista 32 bit pc, mine is windows 7 64bit What free software can i use to backup their photos and files to mine. It needs to be simple enough for them to not accidently delete anything. The computers are in the same house, but theirs uses extension cable (from modem) and mine uses wireless from router, so different network.

Thanks in advance

Easeus To-do backup is pretty good. Macrium reflect is also pretty good.

Of course all these programs will not be able to backup to other computers on the network if you don't have networking set up properly in the first place. If you can't currently move files back and forth between computers, the backup will have no way to backup onto a different computer.