V-79-65323-3023 - Backup and file manipulation operations (such as ALTER DATABASE ADD FILE) on a database must be serialized. Reissue the statement after the current backup or file manipulation operation is completed.
One or more backup or other operations may be pending for the database(s) in SQL which prevents any backup or file manipulation operations.
Check the status of the database in SQL to see if it is in a state such as "Restoring" and if so, allow time for the current operation to complete before attempting another backup.
Alternately perform any of the following: