Any tips to remote backup client side encrypted from TrueNAS scale in GUI?

I think 7-zip with AES encryption is also a valid option, right? Files can be split into chunks and uploaded to any cloud. But it's manual. But very simple And I think good enough for some use cases at least. Thoughts?

How do you protect against your yubi key breaking or getting lost. It is a single point of failure and has always worried me about using gpg in this way.

Have you ever tried Syncthing or Nextcloud? If yes, what do think about that?