WSE2012. Backup regularly hangs while trying to back up one of our server disks to an external usb drive. Both source and destination drives check out ok - no fragmentation, disk errors, plenty of free space. Tried to Stop the backup gracefully via the UI by right-mouse clicking the server listed in Dashboard>Devices tab and choosing Stop backup... but this is unable to stop it.
Tried to stop the block level backup engine service exe (wbengine.exe) but it appears to be orphaned and unkillable.
Task Manager shows wbengine.exe is running, so I've tried doing these things from an elevated command prompt:
1. wbadmin stop job -- this returns The process could not be terminated. There is no running instance of the task.
2. TASKKILL /F /IM wbengine.exe - same error message as above.
Short of rebooting the machine or unplugging the usb drive (which sometimes works but leads to data corruption), how can the backup be stopped and restarted?