Yesterday I suffered a crash on my Desktop/Server. I paid the price for a choice I made 1,5 years ago when I installed it.
Choosing BTRFS as my main FS on my main machine which I planned to keep going for 5+ years.
Listen to the warnings of others, BTRFS is not stable yet, and should not be used if you value your data.
I checked and rechecked the disk and with all the error messages i am sure it was BTRFS that is to blame. The partition is impossible to save. Luckily i have backup of every LXC and important things. But my nextcloud server was completed 2 days ago and I did not back it up yet .
So, use something else for your important systems.