The journaling is at the block device level, not the filesystem level.  So
it works on any filesystem.

The user interface makes people make explicit "checkpoint markers" in the
journal which are known safe points to roll back to.  I could have done it
based on a timestamp, but then somebody might have rolled back into the
middle of a FAT update or missed the last write to a file, and that's too
dangerous.  (An advanced user can figure out how to do it using some pretty
simple file manipulation.)
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