I was using Nix but ran into some software compatibility issues so I’m back on Arch. It’s obviously not immutable and doesn’t have generations, but using btrfs + snapper + snap-pac + grub-btrfs has given me an automated system of snapshots that let me roll back to my system state before or after each package change (As well as weekly snapshots). It has been rock solid and reliable for me. On my Debian server I just use ZFS and snapshot it weekly, which isn’t as easy to roll back but it does everything I need
Lmao