Samba-based TimeMachine with Big Sur

It’s been driving me nuts that file sharing between my linux server and my Mac has been flaky for quite a while with the mounting sometimes failing and TimeMachine having stopped working ages ago.

Therefore, I finally spent some time to dig deeper and to find a working solution. This has been quite complicated since most information on this online is outdated by now because either AFP is still used or the most recent changes through Big Sur aren’t considered.