I would like to create a Remote that shows an encrypted version of the files, pretty much like a Crypt but the other way arround so I can back the files up and even if somebody gets access to the files they are useless.
But it should not be a duplicate of the files but only encrypt the parts that are currently being accessed by the backup software just like the crypt is doing when decrypting files.
I thought there was an issue about this already, but I couldn't find it.
I'm not sure it is necessary though as effectively wrapping your remote in a crypt does this.
So you are proposing
local wrapped with reverse crypt backed up to remote
Whereas you can already do
local backed up to remote wrapped in crypt
The files which end up on remote would be identical either way.
I think the only reason you might want the reverse crypt is if you aren't using rclone for the copy , so you serve the reverse crypt with rclone mount and back that up with some other software.