nbas
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10.0.3.743 (Jan 4, 2011)
I'm not sure why so many people are comparing it to file synchronization programs. I guess people are thinking of rsync, robocopy, carbonite and friends. This is for backups, not synchronization. Sure, you could consider them to be one and the same - but I disagree. What if one of your documents gets corrupted, and you don't notice for a couple of weeks? It'd be unlikely that you'd be able to recover the uncorrupted version of the file.
Cobian lets you keep an arbitrary number of copies with differentials as well as multiple locations for backups. Scheduling is quite useful, too - as well as the encryption and compression functions.
I've found it useful for small companies -
set up a fileserver (Windows or unix/linux)
install cobian on all the desktops
set it to back up each user to the fileserver
back up the fileserver