[clue-tech] "rewindable" drive?

[Patrick H.]

Pretty much every hardware based storage solution out there supports 
filesystem snapshotting.

As for software, I was able to search up this: 
http://tldp.org/HOWTO/LVM-HOWTO/snapshots_backup.html

Though this essentially creates an entire duplicate of the filesystem. 
Hardware based solutions are better as they dont have to duplicate the 
entire filesystem. I'm not sure exactly how they work, but the snapshot 
uses much less space than the size of the whole filesystem.
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