What things are not saved in a btrfs snapshot?
I'm using BTRFS for my root partition and manage its snapshots with Snapper. I decided to create subvolumes for
/var/log as these are constantly changing its data which is not a good idea for scheduled snapshotting. In this way, they are not saved.
However, I noticed that files inside
/tmp where included in the snapshots too, which is not what I want. I was mounting a tmpfs filesystem there but it was saved anyways. I ended up creating a subvolume for it.
I noticed that
/proc are not saved (which is a good thing). What do they do to achieve that? can I do the same for
/tmp? what things are not saved in a btrfs snapshot? besides other subvolumes, of course.