I have a fresh install of Fedora 33. I’m using Amanda to do my backups. I have used Amanda for many years. On this install, I let Fedora install the default btrfs file system. Where in the past I always used ext3 or ext4.
I have noticed that on the first backup following a reboot of the system, Amanda makes an incremental backup of my home directory that is the same size as a full backup. I believe that the reboot is causing btrfs to make a change to the home directory that causes this issue.
This has never occurred with the previous Fedora installs.
Any idea of the cause or how to trouble shoot the problem.