wbadmin stop job
Cancels the backup or recovery operation that is currently running. Windows commands reference
On Windows
Windows
Cancels the backup or recovery operation that is currently running. IMPORTANT: Canceled operations can't be restarted. You must run a canceled backup or a recovery operation from the beginning again. To stop a backup or recovery operation using this command, you must be a member of the Backup Operators group or the Administrators group, or you must have been delegated the appropriate permissions. In addition, you must run wbadmin from an elevated command prompt, by right-clicking Command Prompt, and then selecting Run as administrator.
wbadmin stop job [-quiet]
-quietRuns the command without prompts to the user.