<process name> (<process id>) An attempt to create the folder "<directory name>" failed with system error <error code>: "<error message>". The create folder operation will fail with error <error code>.
Ensure that the security on the backup folders is consistent for allowing NETWORK SERVICE (possibly SYSTEM too) to create and update files and folders. I added SYSTEM and NETWORK SERVICE to the ACL for my backup folder and now everything works fine again.
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