The DB backup scheduled through DB13 is not runnning .There is no log available for this.when you click the date on which it is scheduled the status is showing as unknown.
Apart from the above posts, the other reason might be of SAP Login thru which backups or other jobs scheduled and if the same SAP login is in locked state or deleted then also a chance of failing backups. If that is the case delete all schedules from DB13 and re-schedule from your login freshly. For testing purpose initially you can schedule checkdb during lunch time/off peak period.
As i suggested in my previous post, delete all schedules at once in DB13 and reschedule manually checkdb once and similarly the same with backup (online/offline) as per the regular schedule.
One of the possibility might be, though the job is scheduled to run from DB13 but at the same time corresponding job is not present in SM37 or the user used for job scheduling is not valid of locked etc.
So for the safer side as suggested by other users above, delete the same from DB13 and schedule fresh jobs.
Make sure that the user, being used for DB13 scheduling is having enough authorization to run the job.
First you should try to take backup using brtools on OS level. This will confirm if there is any issue with profile file. If it gets failed, you need to correct that. If it gets success, Schedule backup using some sap id which has proper authorization like super. It should work. Kindly share logs if issue still persist.
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