Full disk and BTRBK steps to delete sub volume about mutschler.eu HOT 1 CLOSED

Thanks for your experience. Your problem was probably due to the use of rm and rmdir, because you need to delete subvolumes using sudo btrfs subvolume delete NAMEOFBROKENSUBVOL. You can specify retention policies both with BTRBK and Timeshift, but remember btrfs is copy-on-write. So if you have a fedora 35 system and you make a snapshot of this and then update to fedora 36 many many files will change and you basically need to have space for two systems at the same time. So manually removing very old snapshots is a good idea (honestly, I never needed to restore something from / from last year or last month, but mostly from an hour ago or from yesterday). btrfs-du is a nice project to show how much space your snapshots take on your disk.

from mutschler.eu.