The importer should Just Work to bring over the entries without any duplicates, unless:
* you've been manually crossposting to both sites (via cut and paste or via Semagic/another client) instead of using the on-site crossposter; * you've been using the on-site crossposter and have ever deleted & re-created your crossposting settings
In those cases, the entries will be duplicated and there's not really much we can do to merge them, and it will be better to create a separate account and import into that as a backup.
In some cases, mostly involving cases where you renamed your LJ account after your last import but sometimes just because the moon is in the seventh house and the importer felt like it, people who first imported their entries when the site first opened will get duplicates when they re-import now. If that happens, you can delete all your imported entries and start a fresh import, or, if you know for sure that there's content that no longer exists on LJ but was imported into DW and you don't want to lose it, open a support request in the Importer category with examples of a few duplicated entries (with the links to the entries both on LJ and DW) and someone will get back to you when they get a chance. It may take a little while, though; these past two weeks have been very hectic!
no subject
* you've been manually crossposting to both sites (via cut and paste or via Semagic/another client) instead of using the on-site crossposter;
* you've been using the on-site crossposter and have ever deleted & re-created your crossposting settings
In those cases, the entries will be duplicated and there's not really much we can do to merge them, and it will be better to create a separate account and import into that as a backup.
In some cases, mostly involving cases where you renamed your LJ account after your last import but sometimes just because the moon is in the seventh house and the importer felt like it, people who first imported their entries when the site first opened will get duplicates when they re-import now. If that happens, you can delete all your imported entries and start a fresh import, or, if you know for sure that there's content that no longer exists on LJ but was imported into DW and you don't want to lose it, open a support request in the Importer category with examples of a few duplicated entries (with the links to the entries both on LJ and DW) and someone will get back to you when they get a chance. It may take a little while, though; these past two weeks have been very hectic!