I am not sure I understood. I have a Nextcloud client and sync to a server I dont trust. Or that I dont want to encrypt with LUKS.

And I want to open decrypted tiles, use them and save them encrypted to a directory that I sync with Nextcloud.

Wooow that looks awesome!

I read about dyne, pretty cool group.

Does that work with Nextcloud too? So send the encrypted stuff to Nextcloud or copy to another dir at least?

Cool! That sounds like a great option.

It needs to be repeatable easily and easy to use for sync. This method would always encrypt everything new.