One (popular) option is using a filesystem that supports snapshots (IE. BTRFS, or maybe XFS). You can set up your system to take snapshots pre-and post-update s

One (popular) option is using a filesystem that supports snapshots (IE. BTRFS, or maybe XFS). You can set up your system to take snapshots pre-and post-update snapshots, or manually, or on a regularly scheduled basis. If you use GRUB as your bootloader, you can boot into a stored snapshot if something gets borked. You can also recover deleted files from previous snapshots.