Uploading backup -> not enough space on disk

After creating a backup and then uploading the one I want to use I get the message that it uploaded successfully but it never appears in the backup-list. Any ideas?

@codinghorror
After trying the whole weekend I wasn’t able to get Discourse running on the pesky OVH-host so I tried pl3bs’ installation-script. I know I could pay more and get better Discourse-hosting but I’m dead set on the cheap solution just for the sake of beeing able to say “yes, it does work”.