dr_tectonic describes it in this post. It's really simple. I've had a DW journal for a while now and periodically back up there. It doesn't keep my many icons because I don't have them at DW, but it does keep posts, photos, and all comments. (It changes commenters' ID to OpenID if they don't have DW, but you can still tell who it is: you can see an example from my own imported post here.)
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Date: 2016-12-30 11:19 pm (UTC)