CobianSoft

After having established that the no. Backup to keep is 1 it happens to me that at the end of backup nr. 2 that only the entry in the history is deleted but not the physical backup.

Then check the permissions to the copied files.

What do you mean by 'Then check permissions for copied files'
I am using an administrator user to copy, I assume I also have ownership and deletion permission. However, this anomaly does not always happen but by chance.

However, this anomaly does not always happen but by chance.

Well, the code is always the same...

Work done today, Log file:
2022-01-22 12:05:03 The Work of directory 'J: ' has been performed.
2022-01-22 12:05:03 * The Work part for the 'Job_J_on_NAS_Complete' task is finished. Job file number: 124665. Job part size: 281.63 GB. *
2022-01-22 12:05:03 Elimination of some complete Jobs and associated differential / incremental Jobs. Reason: keep only 2 complete Work sets not parked.
2022-01-22 12:05:03 The Jobs have been eliminated. Actual files may be deleted on a background thread.
2022-01-22 12:05:03 ** The Work for the 'Job_J_on_NAS_Complete' task has finished. Number of Job files: 124665. Folders created: 8820. Job Size: 281.63 GB. **
2022-01-22 12:05:03 *** Number of errors: 0. Time spent on 'Job_J_on_NAS_Full' task: 3 hours, 34 minutes, 46 seconds. ***

2022-01-22 12:05:04 The Work finished without errors.
Jobs contained in the NAS:
J 2022-01-08 08; 30; 17 (Complete)
J 2022-01-15 08; 30; 17 (Complete)
J 2022-01-22 08; 30; 17 (Complete)
Work contained in History:

Hello VascoVicenza,

Does your (local) administrator have delete rights on your NAS ?
Is "Copy file attributes" in Settings, Engine checked ?