Seeing some rumblings about Tumblr banning Internet Archive. That's not true, thankfully! All our crawlers are up and running (you can check by going to https://web.archive.org and using the Save Page Now feature! e.g: http://makyo.io/tumblr-spn-test ).
THAT SAID, ArchiveTeam's project to archive Tumblrs is racing right up to the finish line! If you want to run a Warrior (distributed crawler), you can find out more here: https://archiveteam.org/index.php?title=Tumblr
Update! Tumblr is apparently banning chunks of ArchiveTeam (who does warrior stuff). They're not IA, but that doesn't mean it's not shitty for Tumblr to do :S