I am trying to create a scheduled backup on a Server 2008 R2 box (using the built-in Windows Server Backup UI). Whenever I run a backup manually (image or otherwise), it works perfectly. When I try to schedule the same backup I get all the way to the end and it pops up an error saying:
Logon failure: unknown user name or bad password
I'm copying to a network drive via a UNC path, but I've confirmed the user/pass I'm entering there are correct (if entered wrong it immediately prompts again). Once this error pops up, I hit OK and the status just says "The backup schedule was not created."
As a final note, this had been tried under both the built-in administrator account and a separate admin account. It's a standalone box (no domain) and both accounts I've tried under are part of the local Administrators group.