What platform are you using? I don't know anything about the tools available for Windows, but I know they exist, and someone will be able to advise you. If you're on a Mac, there's a neat Python tool that will import your entries, and archive your entries, comments, and icons to your own hard drive. Sadly, though, it won't migrate comments; I'm hoping someone figures out a way of doing that, but I don't know of anything at present.
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