SQL error 15157: Setuser failed...

hi everyone!

i'm using SQL Backup 7.3.0.57 with SQL Server 2012. If i try to backup a database with local and network copy, it work but if i schedule a backup with the same options, i get an error message:

Quote:

SQL error 15157: Setuser failed because of one of the following reasons: the database principal 'domain\backupserviceaccount' does not exist, its corresponding server principal does not have server access, this type of database principal cannot be impersonated, or you do not have permission.

I tried the solution of adding the SkipChecks key to the BackupSettingsGlobal(local) registry node explained here http://www.red-gate.com/messageboard/viewtopic.php?t=9343&highlight=skipchecks but it didnt worked.

To make it work, i had to put the SkipChecks key to the namedInstance inside the BackupSettingsGlobal node.

So here's my questions:

1. Is there a reason why the SkipChecks in the root of BackupSettingsGlobal don't work here?

2. Why do we have to do that? I didnt find any documentation that tell us that scheduled backup use the SQL Agent Service account instead of the SQL Backup Agent service account. What is the purpose of this check and why do we need to skip it to solve this? Is it a bug? a feature?

thank you for the help!