Yesterday, I accidentally removed an authenticator app from my phone. Fortunately, I have another copy of the app on a different device. It made me realize how easy it is to lock myself out of my accounts. Do you think it’s a good idea to create a Windows VM with an Android emulator on it and install copies of all my authenticator apps, this will not cause any security issues?
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Just use a sane authenticator app that lets you export the keys, and backup those safely.
I’ve been using aegis which is available on F-Droid. Whenever I add a new “critical” account I make a backup of the data. That’s it.