Yep, I can add that backups in Obsidian are automatically managed and stored on the iCloud Keychain, hence accessible just by using the app on any device
I haven't been using Authy for years, last time I checked there was no easy way to export data from it (they want to keep you tieeeed!), but hopefully things have changed.
You would only need to edit/export the "secret" and copy/paste it to Obsidian, in case they allow it.
Can I import my OTPs from Authy?