Tumblr has become increasingly unreliable.
Right now, the only export tool they offer to remove posts from their system is for Mac OS X. There’s no app for Windows.
I have no idea why an app is necessary for this. WordPress can export my blogs with my hitting an on-screen button to Export XML.
So, I’ve started to manually copy/paste posts out of Tumblr to a WordPress blog that duplicates most of the content.
That blog is: Mike Cane’s Tumblr Evac
Now when I need to find or link to a past Tumblr post, I can use that.