I used it for a while, it is quite good, but I recently switched to a webxdc (in-chat mini-app) in Delta Chat which allows me to access the codes from any device where I have Delta Chat installed and adding a new token in one device synchronizes to all other devices this also mean that my tokens are safe if one of my devices die and I will not lose them. All of this is without depending on a server holding your data
Go to your "Saved Messages" chat there you can save notes or use mini-apps in private, click the paperclip attachment button select the apps button you will see the mini-apps list, some useful apps are the to-do list app to track things you need to do or shopping lists, and the one called TOTP is the one I was talking about for 2FA PINs, the Time tracking app is also useful
No need bud no need for additional app, no need for unencrypted backup files exposed on filesystem public storage, just use Delta Chat bud, just use Delta Chat