Content of the site has partly disappeared after last upgrade

[raphraph]

Describe the bug

After last upgrade, I land on a fresh "Install" page when visiting my website.

I checked and the content which has disappeared are the default pages (1-home and 9-about). My media files are there, the other pages that I had created are there too.

But maybe some config files have been overwritten since when visiting the site it proposes to "install" the site (create user/ password) as if it was a fresh install.

Context

• Hardware: Raspberry Pi at home
• YunoHost version: 11.2.5 (stable)
• I have access to my server: Through SSH | through the webadmin
• Are you in a special context or did you perform some particular tweaking on your YunoHost instance ?: no

I upgraded from version 0.8.20~ynh4 (for which I have the pre-upgrade backup files) to 2023.09.23~ynh1

Steps to reproduce

Upgrade.

Expected behavior

Content not disappearing 😥

Logs

I can provide logs if needed, just tell me which logs.

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I can recover the missing files from the backup archives, but maybe the best is to recover the backup and wait for a fix in order to upgrade correctly ?
I'm afraid of missing the recovery of some config files which could cause problems later on...

Thanks for your help !

[raphraph]

I tried to make an app upgrade on my yunohost system but the upgade fails because the pre-upgrade backup fails (error "nothing to save").

Since last time I managed to recover part of my site content which had disappeared during the upgrade (see above) from the pre-upgrade backup, I really want to make a backup before making any new upgrade.

I'm wondering if the backup failure can be related to how I recovered my site last time...

Any help/hint is appreciated.

Edit : I realize that there has been more than 10 new shipped versions between my actual Yellow version (2023.09.23~ynh1) and the actual one.