During a database backup or restore operation, the server runs out of recovery log space.
If the database backup was started with the BACKUP DB command, the database backup is ended and server operation continues. If the database backup was triggered automatically, the backup stops and the server waits for the retry period to expire and then tries the database backup again. A database restore is terminated.
For database backup, make more server recovery log space available, if necessary. For database restore, contact your service representative.