A quick guide to backups using tar: "
Though tar is widely used for archiving it is rarely used for daily backups because it has no incremental capability - or at least, most people don't think it has.
In fact, the GNU version of tar has a perfectly good mechanism for creating and restoring incremental archives; it just isn't very well documented on the man page and you have to hunt around to find a proper description.
It works by storing additional metadata in a separate file called a snapshot file.
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(Via Clippings.)
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