Server Backup COMPLETED WITH WARNINGS
"The credentials I'm using for the backup task are the domain admin creds so it has full access to everything"
Do you mean the credentials you use to run the Backup Service or the credentials you've specified for the NAS while adding it? Just to make sure, could you please check what account is used to run the Backup Service? Please go to Tools/Change Service Account. If you have it set to "Local System Account", please change it to your administrator account and click OK. The Service will be restarted automatically.
Check if the scheduled backup runs OK after that or not. If the issue persists, we will require the diagnostic logs for further investigation here:
Go to Tools > Diagnostics in the program menu. In the opened window click Send button. The logs will be sent to our support team automatically. This will help us diagnose and troubleshoot the issue. Please add "Logs for ticket #309055" to the issue description.
Please put the link to this Forum thread into the description of the logs.