Same thing has happened two sites now; updated from 2.1.6 to 2.2.7 taking a backup beforehand. Counter ticked to 100% before but post on both it gets stuck at 10% and I get “Send request to create backup” in the log but never a “Create database backup”, “Database backup complete”, “Backup successful complete!” or “Please, don’t delete the line that is lower, it is used for technical purposes! as I used to.”
On the restore page there’s an entry for the backups that “don’t complete” and there’s a SQL backup downloadable that is clearly incomplete if I compare with the backup before the upgrade; it matches until usermeta table which gets created but then only a couple of entries are inserted. The backup file is roughly 20% the size of the pre update file.
Is this known issue? Do I uninstall/reinstall or what’s the recommendation?