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Create a file format for the data and connect to the user's Google Drive or Dropbox.

That's an awesome idea for this kind of applications. Does anybody know a sample app using this feature?

Its open source too, I think.

Just make it a part of the default UX flow to print out a paper key -- like the paper wallets that consist of a dozen random key words that let you back into your account.

I guess if the user accepts this risk they can opt to do it or go for unencrypted otherwise.

Saving on Dropbox etc (can be done from client) might be a middle road if one trusts them more.

Or a local app with the data stored locally. Or even a web based app, but with the data stored in browser storage.