Hyper-v backup does not run

Just installed free edition on a Win 11 pro. Agent was automatically installed on the hyper v host server Win2019 without problem and the agent is running. Alloted the backup server. Assigned license to a VM to backup. Created a backup job with a destination to a local usb external drive. Scheduled immediately and it succeded with one backup. Then nothing else, no run of backup at scheduled time and no history log o failure, no message. I decided to delete the backup job and recreated a new one with an immediate schedule but nothing: no backup, no message, no history log. Any idea to solve the problem?

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