At the moment, doing manually. There looks like there might be a way to crosspost from WordPress (I just set that up, haven't tried it yet).
But in general, for my original content-stuff, I type everything up in Word or Gdocs first, and then copy paste into Tumblr (previously) and PF/DW (now), so copy-paste into a couple blogs isn't that much more work than doing it in one blog. And that means I already have a backup copy on my computer/gdrive should something happen to the blog site I'm on (having lived through FFN and LJ Strike through, I've always kept backups of my original content stuff)
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But in general, for my original content-stuff, I type everything up in Word or Gdocs first, and then copy paste into Tumblr (previously) and PF/DW (now), so copy-paste into a couple blogs isn't that much more work than doing it in one blog. And that means I already have a backup copy on my computer/gdrive should something happen to the blog site I'm on (having lived through FFN and LJ Strike through, I've always kept backups of my original content stuff)