Apart from using Mercurial for version-control I found a few cases, where it is fairly suitable as a ... backup tool.
I am maintaining some MoinMoin wiki. MoinMoin saves its data using the disk files. I won't delve into all details now, but my wiki instance is kept in a directory with subdirs for configuration data, runtime scripts, plugins and - finally - the wiki data - pages written by users, user preferences, and such.
My initial backup procedure was simple - just
tar the directory, compress and copy to the remote machine. Slightly troublesome and ... giving only the last version for possible restore. Plus noticeable transfer every time new base backup is made.
Mercurial provided very nice alternative:
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