If I start importing my LJ to DW, will the previously crossposted posts made after March 2010 be duplicated in DW, so that I have two copies of every post from 2010 on?
Shouldn't. You'll have the new comments that showed up on your cross-posted entries (as OpenID names unless someone's claimed their OpenID here) but you shouldn't have duplicates unless you've edited the entry over there but not over here or something else like that.
(And I think it's still a thing where if you turn of JavaScript you can go in and import without agreeing to the TOS, but I don't know how long that'll last if it's still a thing.)
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Date: 2017-04-12 04:45 pm (UTC)From:Shouldn't. You'll have the new comments that showed up on your cross-posted entries (as OpenID names unless someone's claimed their OpenID here) but you shouldn't have duplicates unless you've edited the entry over there but not over here or something else like that.
(And I think it's still a thing where if you turn of JavaScript you can go in and import without agreeing to the TOS, but I don't know how long that'll last if it's still a thing.)