Thanks for reaching out and thank for using Total UpKeep Premium. Sorry to hear you having trouble restoring your backup.
Yes you can restore your database manually using cPanel if you would like. You can navigate to Total Upkeep<<Tools<<Logs and select the .log file for your restoration to view the outcome of the restore.
If the database restore is still running I would wait and let it either time out or run its course so that you can generate the correct error message if there is one.
I hope this helps. Please reach back out if you have any other questions.