Actually the newest version does allow export. For years it was true you couldn't export. But now they allow you to export. Thankfully. Though I tend to use U2

Actually the newest version does allow export. For years it was true you couldn't export. But now they allow you to export. Thankfully. Though I tend to use U2F. With Yubikeys and other U2F keys. I use my Yubikey to store a backup of the TOTP (Authenticator type) codes. I also set a password and touch required to generate the codes.