[otachack]

As alternatives: I use Authenticator Pro on my phone and keep encrypted backups whenever I modify it. I know others have pointed out Aegis.

The issue is starting the migration out of Authy. Assuming Authy has no easy export, I suggest you migrate over a few entries at a time (maybe from top down) while keeping account of transfers somehow. You can have authenticators live side by side in the meantime!

[cmgbhm]

You can rename them as they are migrated