Just specify from: on and to: off in the trigger. You can have both!

I don’t know your automation format very well. My automations use a state trigger with from: and to:

Some apps have breaking changes. If you can restore a complete backup when that occurs, you can recover. Immich is famous for its breaking changes

I would recommend to avoid Scaleway. They simply lost part of my files in the first week. Were very unresponsive and in the end could not recover. Pretty much everything you are hoping to never encounter with a storage provider.

I use the Home Assistant companion app instead of Tasker. It has similar access to automate phone stuff

I have had a lot of fun setting up Unraid. It has everything you are looking for. It does cost some money to start, but was very much worth it to me.