3 ms·the snapshot idea has been implemented in DragonflyBSD's HammerFSby Andys 16y agothe snapshot idea has been implemented in DragonflyBSD's HammerFSadsr 16y agoAnd ZFS.rbanffy 16y agoAnd BtrFS. On Linux.Andys 16y agoNot quite. Hammer lets you look up the state of a file at any given timestamp. ZFS makes you take snapshots regularly and then lets you look at the state of the file at a given snapshot.