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The Previous Versions feature of Windows looks fine. However I don't seem to have any control on creations of backups of files in particular (as opposed to backup everything). If you change a file three times in a day, you'll have to wait up to 24 hours to get it backed up, and only the latest version will be stored.

With VCSs you can do 'commits': you explicitly tell the system to save the previous version of the file, and then you overwrite the visible file. Isn't there a similar option included with the built-in backup system in Windows?

If not I'd just use a VCS or backup system but it would be nice to use something fully integrated.

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"Previous Versions" are based on Volume Shadow Copy, which essentially is a snapshot of the entire filesystem at block level, so it cannot work on separate files.

You can manually create a shadow copy by using vssadmin create shadow /for=c:.

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Thanks for clarifying the inner working of Shadow Copy. The fact that it runs at a low level (no files) is enough reason to me to choose an external program, in that case –  vemv Jun 23 '11 at 19:41
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