Free backup for Tumblr
Revert.io just added free backup for Tumblr accounts. It’s by invitation only while they bed it in, but join the wait list and they’ll get you in as soon as they can. The service keeps an independent backup of all post types (excludes audio and video streams but grabs everything else, including photos), and can restore individual posts as draft items in the event something goes awry. They also support a handful of other apps as both free and paid options, including MailChimp, Campaign Monitor, Evernote and more.
Well, free… I suppose, tumblr posts are mostly public anyway. Maybe it’s worth trying.