The database file is locked database is locked

I’m in the middle of a backup, and paused it so that I could test file restores. However when I try to restore I get this message: Failed to connect: The database file is locked database is locked.

Do I have to wait until the backup is completed before looking at files to restore? I just don’t want to wait 1 week for the backup to finish before looking at a big backup.

Found this in the log files, not sure if it helps.

Aug 23, 2017 10:22 AM: Failed while executing "List" with id: 2
Aug 23, 2017 10:22 AM: Request for http://tower:8200/api/v1/backup/2/filesets gave error
Aug 23, 2017 10:22 AM: Reporting error gave error

thanks
david