Hi,

> 1. How could I upgrade my owncloud server from owcloud 8 to owncloud 9
> without loss data ?

upgrading manuals are available here:

https://doc.owncloud.org/server/9.0/admin_manual/maintenance/upgrade.html

Just make sure that you're not skipping major releases (e.g. going from
8.0.x directly to 8.2.x or 9.0.x)

> 2. On my ownclud admin page, I have this error message :

Those messages have various links leading you to the existing documentation.
It should be easy to follow those links to get the needed info how to
configure your environment correctly.



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