Interesting. Some remarks/observations.
This kind of package for me would be to restore the system files in case my computer gets messed up irrecoverable.
One has to indicate which files to include, so that is all system files. In Ts the only ones that are excluded are /home/username (which I understand) and / (root - I don’t understand why).
So, the file system files presumable include everything in the highlighted folder below, except home, though I don’t know where root is.
Note that on the Github page there are some 250 open issues, which seems quite a lot to me.
BTW, @s88, @NX-01, Ts is now making snapshots automatically for me, perhaps because I enabled cronie, as told by @dalto.