On Wed, 4 Oct 2017 08:58:39 +1300, Peter Reutemann wrote:
'TimeShift is ... quite similar to ... the Time
Machine tool in MacOS.
... Snapshots are made using rsync and hard-links and the tool
shares common files amongst snapshots in order to save disk space'
No doubt using the --link-dest option in rsync.
Which is better than playing fast and loose with the integrity of your
file system, which is what Apple’s Time Machine does.