Set up BTRFS snapshots with Timeshift or Snapper. Switching to BTRFS is worth it for snapshots alone.
Do regular backups on a device that can not be reached by rm: vorta local on external hdd that you connect once a week OR vorta/borg2 to a NAS/Server that does BTRFS snapshots itself OR Nextcloud to sync to a server that has a trashbin OR git to a server. Just remember that Nextcloud and git are unencrypted, so the server has to be secure and trustworthy. Vorta and borg2 can be set up with encryption.
Mistakes are unpreventable due to our error-prone brains, but it is a choice to repeat them.
Tipps to prevent future accidents:
Mistakes are unpreventable due to our error-prone brains, but it is a choice to repeat them.
you can setup encrypted Nextcloud