Depending where you go. If you go to the coast there’s a lot of humidity. On the center the climate is very dry and the nights are not so hot. Typical day in interior spain temperature can go from 10C to 35C easily.
Still pretty hotter than the rest of europe overall.
Climate wise the worst is that we are very vulnerable to climate change. Our highest temperatures are already pretty high so higher temperatures in summer will be deathly. Also some parts of Spain are vulnerable to drastic climate events, recently two hundred people die in a heavy flood in Valencia.
I have it on docker with two volumes, ./config and ./cache
I back up those before each update.
A bad Jellyfin update should not mess with your media folder in anyway. Though you should have backups of those aswell as a rule of thumb.