@girish my initial questions are all resolved now. I'm having some new problems though. Namely that it seems the Cloudron installer is installing Gnome which is making my server enter sleep mode. I disabled it now but I'm confused as to why Gnome is being installed.
@robi The fsmetadata.json is only used in rsync backups. It's used to keep track of empty directories and 'x' bit of files when using rsync mode. We do this because object storage services (like s3, gcs and friends) cannot track this since they are not a filesystem but an object store.
This is not needed in tgz because tgz format can encode this information inside the tarball.
In essence, fsmetadata.json is usually owned by root. If it's owned by yellowtent, it's probably because maybe you restored the Cloudron in the past or something. The restore logic changes the permission of all files to yellowtent after downloading so that restore can continue as non-root user.
@girish Ah okay, that makes sense on the tgz part. Unfortunately I haven't had much success at all in any quicker times (in fact it's often closer to double the time than tgz, taking between 1-2 hours) when using rsync in my tests for OVH Object Storage. But maybe I just haven't found that 'sweet spot' yet. I'll keep testing. Thanks Girish.