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 Today is a good day to create a secure off-site data backup.
https://blog.lopp.net/how-to-securely-back-up-data-to-cloud-storage/ 
 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. 
 You can load a GPG key into multiple yubikeys.

Any decent service should allow you to add multiple 2FA yubikeys. 
 Have you ever tried Syncthing or Nextcloud? If yes, what do think about that?