I used to use them a while back but now I use Aegis. I prefer my 2fa offline and disconnected from the internet. I still keep my backups saved in safe spaces though. It served me well to get off of Authy too because last year, they got compromised.
Well, that's what backups are for. I sync my Aegis backups between phone, tablet and PC via syncthing.
It's convenient to have authy handle bwckups for me, but if I use 2fa I don't want to water down its usefulness right away.