Update 21.0.7. to 21.0.9 Create Backup Time-Out

I-m working with Nextcloud under Plesk.
I try to update my nectcloud 21.0.7 to 21.0.9. At “Create backup” it stopps:

*Create backup

Parsing response failed.
Show detailed response

<head><title>504 Gateway Time-out</title></head>
<center><h1>504 Gateway Time-out</h1></center>

No idea how I could solve this problem.
Would appreciate any help. Thanks.


The logfiles might help you to identify the problem:

and the logfiles of your webserver. Could be anything from timeout, exhausted resources, permissions, …