Instead of uploading all contacts to Nextcloud, thunderbird decided to delete all contacts locally. Great.
And so did DAV5x on my phone... What the fuck.
@kensp I generally try to keep file backups of contacts and calendar for exactly this reason. Any idea what happened?
Well, it was my stupidity.
I installed the contacts app on nextcloud and everything had the same name as before. Hit sync on thuderbird, which saw that nextcloud was empty so it deleted all my contacts...
Linux Geeks doing what Linux Geeks do..