upgrade 3.0

Hello, I just upgraded from PBS 2.1 to 3.0 and all backups in the UI disappeared. ALL the files are still present in the datastore tho. I suspect this is related to the new namespace feature. I then edited my config in the PVE cluster, set a namespace and manually did a backup which worked...

I have PBS installed in a LXC container and was wondering how strict the minimum 5GB space requirement is for the upgrade? Anyone out there who has upgraded PBS in a LXC container? Thanks.