when restoring, cannot scan backup folder

hello,
Nextcloud version (eg, 20.0.5): 20.0.4
Operating system and version (e Ubuntu 20.04): lubuntu
Apache or nginx version (eg, Apache 2.4.25): Apache
PHP version (eg, 7.4): 8.1

I did a brand new installation on new plateform, and installed backup app on this new instance.
I try to restore backup from on old instance made with same app, I followed these steps :
https://github.com/nextcloud/backup#restore-workstation

4 hours after right clic / "scan backup folder" on my restoringpoint.data file, there is still nothing shown by ./occ backup:point:scan nor ./occ backup:point:list.

I tried to move all the files to the app directory as well, with no success.

tail of Apache error logs :
cat: /sys/class/net/wlp2s0/speed: Invalid argument

sudo -u www-data /var/www/nextcloud/occ backup:point:scan returns nothing

same for list :
sudo -u www-data /var/www/nextcloud/occ backup:point:list

• retreiving data from local
  +-----------------+------+----+----------+--------+---------+--------+----------+--------+
  | Restoring Point | Date | NC | Database | Parent | Comment | Status | Instance | Health |
  +-----------------+------+----+----------+--------+---------+--------+----------+--------+

any suggestions ?
thanks for your help.

Is this the first time you've seen this error? (Y/N): Y

Steps to replicate it:

The output of your Nextcloud log in Admin > Logging:

[no app in context] Warning: Host localhost was not connected to because it violates local access rules

POST /index.php
from 127.0.0.1 at 2022-10-15T11:42:59+00:00

The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):

PASTE HERE

The output of your Apache/nginx/system log in /var/log/____:

PASTE HERE

PASTE HERE

Output errors in nextcloud.log in /var/www/ or as admin user in top right menu, filtering for errors. Use a pastebin service if necessary.

PASTE HERE

Start with the restore-workstation instructions linked in the issue and reproduce the behavior using occ backup:point:scan and occ backup:point:list as www-data. Inspect the backup app's handling of the restoringpoint.data file and the Apache and Nextcloud log output; done means the backup point is discovered and appears in the list.