backing up remote database

Microsoft SQL Server

when I try to schedule a backup, or just do a backup, of a remote database
I get this error message:

"database 'msdb' cannot be opened. It has been marked SUSPECT by recovery."

I can connect to the database and view it.
I checked the error logs and there is no information about this error
I googled the error but did not find any solutions

Any insights to this error message ?
Answered in .programming

Please don't multi-post.