Urbackup Backup Path Synology Nas - Error creating temporary file

Hi, I just did some backups of Linux systems and realized that I have 102 warnings that read like this:

|Level|Zeit|Nachricht|
| --- | --- | --- |
|Warnungen|12.06.24 06:04|Error creating temporary file path. No such file or directory (code: 2)|
|Warnungen|12.06.24 06:04|Error opening temporary file. Retrying...|
|Warnungen|12.06.24 06:04|Error creating temporary file path. No such file or directory (code: 2)|
|Warnungen|12.06.24 06:04|Error opening temporary file. Retrying...|
|Warnungen|12.06.24 06:05|Error creating temporary file path. No such file or directory (code: 2)|
|Warnungen|12.06.24 06:05|Error opening temporary file. Retrying...|
|Warnungen|12.06.24 06:05|Error creating temporary file path. No such file or directory (code: 2)|
|Warnungen|12.06.24 06:05|Error opening temporary file. Retrying...|
|Warnungen|12.06.24 06:05|Error creating temporary file path. No such file or directory (code: 2)|
|Warnungen|12.06.24 06:05|Error opening temporary file. Retrying...|

I also have 2 errors that read like this:

Level	Zeit	Nachricht
Fehler
12.06.24 06:05
Error creating temporary file in ::doIncrBackup
Fehler
12.06.24 06:05
Backup failed

I’m not sure how to start fixing the problem.
The original backup server is also a Linux system. It uses an external storage as storage path.

It is integrated via NFS:
IP:/volume5/Urbackupserver /My/Backup/Path nfs vers=4.1,proto=tcp,port=2049 0 0

The target is a Synology Nas. There I have set up the export for NFS accordingly:
Squash: Assign all users to Admin

As a result, the files on the Nas all belong to “admin”. Urbackup is installed natively and can also access the folder or path regularly and also backs up data.

On the server itself, I have activated “Temporary files as file backup buffer:”. As soon as I deactivate it, I can no longer make backups. This is followed by “Backup failed”

I’m not sure how best to approach and solve the problem.