I think there is no such Option in LOS yet. GrapheneOS on the other Hand has this Option for years. If you want to safe at least your signal messages/contacts Molly has a similar function to encrypt after a setted time of not using it.

Events is missing Gancio. Its worth a look :)

The Screenshot? I would say ‘The Boys’

Looks like i need some glasses

I use syncthing for regular syncing of files and warpinator for single files.