This would be the ideal situation. It would require the capability for the desktop application to be able to restore encrypted data from a USB drive, but it wou

This would be the ideal situation. It would require the capability for the desktop application to be able to restore encrypted data from a USB drive, but it would be a good midpoint between #2 and #4 that I think many security-conscious users would find acceptable. Bonus points for open sourcing a tiny "backblaze decrypter" command line utility that can do this manually. Though maybe that's a stretch.