Update with tool and data permission folder

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Nextcloud version (eg, 20.0.5): 25.0.10
Operating system and version (eg, Ubuntu 20.04): RaspberryPiOS
Apache or nginx version (eg, Apache 2.4.25): Apache 2.4.56
PHP version (eg, 7.4): 8.0.30

The issue you are facing:

Whenever I update my Nextcloud server through the update tool, the update always hangs while copying old files. At this point I have to redo the update manually.
I could be wrong, but could the problem be due to permissions of the DATA folder?
If my server is on a RaspberryPi, I have the data in a folder created specifically on a NAS connected to a LAN. With the update tool, I create the backup in a subfolder on the NAS, which is why I think there is a permissions problem, even if everything else works correctly and from the Nextcloud interface I can reach, create and modify everything my data. Below I report the permissions of the Nextcloud data folder and its main subfolders.
I’m tempted to give permissions for the entire folder to www-data, but I don’t want it to break everything.
Thank’s.

drwxr-x--- 10    1024 users    4096 29 ago  2022  NextCloud

drwxr-x--- 10 1024 users      4096 29 ago  2022 .
drwxrwxrwx 15 root root       4096 10 set 17.55 ..
drwxr-xr-x  5 1024 users      4096 19 feb  2022 admin
drwxr-xr-x 13 1024 users      4096 25 ago  2022 appdata_ocvm0qngwepo
-rw-r-----  1 1024 users     12488 25 mar 10.16 audit.log
drwxr-xr-x  3 1024 users      4096 19 feb  2022 files_encryption
drwxr-xr-x  2 1024 users      4096 10 set 16.25 files_external
-rw-r--r--  1 1024 users       542 10 set 16.25 .htaccess
-rw-r--r--  1 1024 users         0 10 set 16.25 index.html
drwxr-xr-x  8 1024 users      4096 10 lug  2022 user2
drwxr-xr-x  8 1024 users      4096 27 ago 22.38 user1
-rw-r-----  1 1024 users  78642166 10 set 20.00 nextcloud.log
-rw-r-----  1 1024 users 104881302 29 ago  2022 nextcloud.log.1
-rw-r--r--  1 1024 users         0 10 set 16.25 .ocdata
drwxr-xr-x  6 1024 users      4096  5 apr  2022 user3
-rw-r--r--  1 1024 users    267821 10 set 16.02 updater.log
drwxr-xr-x  4 1024 users      4096 10 set 16.02 updater-ocvm0qngwepo

Is this the first time you’ve seen this error? (Y/N): NO

Steps to replicate it:

  1. Update with Update tool
2

Normally the update does not touch the data-folder. Perhaps just one folder where it puts a backup of current code. But it needs full access to the code folder, if the process is run as www-data and the permission are set like you have shown here (with users as user), www-data can’t move and replace files.

3

OK thank you. So if I wanted to change the permissions of the entire nextcloud folder (therefore including all subfolders) and give them to www-data, nextcloud shouldn’t give me any problems accessing that data, right?
If so, how should I assign permissions? Are the ones indicated for the installation folder OK during manual updating, like the ones below?

chown -R www-data:www-data nextcloud
find nextcloud/ -type d -exec chmod 750 {} \;
find nextcloud/ -type f -exec chmod 640 {} \;
4

Yes, they look good.