>> I don't think rsync does incremental backups. In other words, if you
>> wanted to restore an earlier version of a file, it's not possible.
>>
> If you want to keep track of various version of a file, you need a
> revision control system (and then backup the repository), such as
> (<start holy war>): mercurial, cvs, rcs, svn, git, ...
> ( holy wars never stop, no end tag)

 From what I've seen, several revision control systems *claim* to 
support large binary files, but barf if you actually try it...

There are plenty of other ways to achieve this though. E.g., find all 
the files with the "archive bit" set, dump them into a dated folder, 
reset the archive bit on all the files you just copied. (That's why this 
file attribute exists in the first place, after all...)

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