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NAS server is blocked by another app

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trrying to back from one disk of a NAS server to another but i get this message.

 

any ideas?

 

i'm i sending also log

 

 

28/9/2018 9:39:11 μμ: 00 1880 I00640000: Backup reserve copy attributes: format tib; need_reserve_backup_copy false;
28/9/2018 9:39:11 μμ: 00 1880 I00640002: Operation AE-DATA started manually.
28/9/2018 9:39:11 μμ: 00 1880 I00640000: Backup reserve copy attributes: format tib; need_reserve_backup_copy false;
28/9/2018 9:39:11 μμ: 00 1880 I013C0000: Operation: Backup
28/9/2018 9:39:11 μμ: 00 1880 I0064000B: Priority changed to Low.
28/9/2018 9:39:12 μμ: 00 1880 I0017001A: Error 0x17001a: Failed to create snapshot for backup.
28/9/2018 9:39:12 μμ: 00 1880 I000B03F0: Create Backup Archive From: \\DLINK-NAS\Volume_2\AE-DATA\
To file: AE-DATA_inc_b2_s3_v1.tib Compression: Normal Exclude: System files
28/9/2018 9:40:43 μμ: 00 1880 E00170027: Failed to back up file or folder '\\?\UNC\DLINK-NAS\Volume_2'. It may be blocked by another application.
Failed to back up the file. (0x170027)
Path = "\\?\UNC\DLINK-NAS\Volume_2",
$module = "ti_demon_vs_13660"
Archive::BackupOperationContext::OnError:
c:\bs_hudson\workspace\544\archive\backuper.cpp(825)
Error occurred while reading the file. (0x40001)
$module = "ti_demon_vs_13660"
ChunkNTBackupStream:
 

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George, welcome to these User Forums.

Has this backup task ever worked previously, or is this the first time of trying this?

Error 0x17001a: Failed to create snapshot for backup.  is normal for this type of backup as snapshot is not possible for remote NAS files.

Failed to back up file or folder '\\?\UNC\DLINK-NAS\Volume_2'. It may be blocked by another application.
Failed to back up the file. (0x170027)
Path = "\\?\UNC\DLINK-NAS\Volume_2",
$module = "ti_demon_vs_13660"

The second error is suggesting an issue with the remote source folder location or contents.

The log also shows that you have not updated ATI 2019 to the latest build version 14110 and are still on the original build 13660.

I would suggest trying to do a backup of the \\DLINK-NAS\Volume_2\AE-DATA\  folder or some small files or folders from the same to an external backup drive to see if you get the same error or not?  This will eliminate the remote NAS backup store location from the issue.