It's not necessary accurate to say timeshift is filing the drive. All timeshift is doing is the taking and management of snapshots. You could only have timeshift configured to keep 4 hourly snapshots, which wouldn't reasonably fill a drive. Now if you 6 monthlys configured, sure you could fill up drive no problem since it will take at least 6 months before deleted data is removed.
Question about the video. I've never used btrfs or Timeshift, so maybe this is just a thing with them, when he jumps to the CLI and unmounts, remounts RW, changes the @rootfs @, adds a dir and then mounts the subvolume on /dev/sda2 to /target.
This is totally new to me and I was wondering if anyone had an explanation as to why this was necessary?
I'm used to EXT4 and that's what I run. But if BTRFS has FINALLY gotten stable and usable and I can take snapshots and roll back to older ones, kind of like branches in ostree, then maybe it's worth this little extra work.
From what I find subvols are their own isolated branch with their own hierarchy. Is this how they're meant to be used? Manually creating them and mounting/unmounting?
Also anyone know if JustALinuxGuy is on Fediverse/Mastodon or a way to reach them about uploading these incredibly instructive videos to Peertube such as TILVids?