> this is kind of expensive and also non-obvious as Yubikey primarily sells single keys Unless you need the GnuPG or SSH applets, I just use the $14 FIDO keys

> this is kind of expensive and also non-obvious as Yubikey primarily sells single keys Unless you need the GnuPG or SSH applets, I just use the $14 FIDO keys from Identiv. They are also NFC capable for my mobile devices also. I keep one at my office, one at home and carry one in my pack. I too wish there were a way to keep them in sync or back them up. Maybe a virtual FIDO key? https://github.com/bulwarkid/virtual-fido https://github.com/bulwarkid/virtual-fido