NAS BACKUP PLUGIN ERROR

##### ISSUE TYPE

* Bug Report

##### COMPONENT NAME

~~~
NAS BACKUP PLUGIN
~~~

##### CLOUDSTACK VERSION

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4.20
~~~

##### CONFIGURATION

##### OS / ENVIRONMENT

Ubuntu 22.04 / NFS

##### SUMMARY

The Jobs failing with error "jobresult":{"errorcode":530,"errortext":"Failed to create VM backup"},"jobinstancetype":"Backup","created":"2024-12-05T13:42:24+0200","completed":"2024-12-05T13:42:24+0200","jobid":"b22226f7-2d2b-43fa-801c-61e5af8a6870"}}

##### STEPS TO REPRODUCE

~~~
Backup plugin has been enabled on the Zone side.
An offering is created.
VM is assigned to backup offering
a Backup is initiated manually from UI.
~~~

##### EXPECTED RESULTS

~~~
Take instance backup
~~~

##### ACTUAL RESULTS

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A directory is created in the /tmp of the hypervisor running the VM
A folder under the VM name is created in the mounted nfs
The UI returns "Failed to create VM backup"
~~~

Start by reproducing the manual VM backup with the NAS backup plugin enabled on Ubuntu 22.04/NFS, then inspect the plugin, hypervisor, and NFS logs around the 530 error. Done means the backup completes successfully and the UI no longer reports "Failed to create VM backup".

Written by the indexing model from the issue text.