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If you mean lose access to the server, then the google-authenticator sets you up with a few emergency one-time codes you could write down on a note and keep safe, in case your phone is lost.

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Not to mention you can write down the seed itself and simply type it into another phone.

I don't think google-authenticator does that, I think Gmail does that.

There's a bunch of references to scratch codes in the pam google-authenticator module, but I haven't actually tried to run the code.

http://code.google.com/p/google-authenticator/source/browse/...

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