rex-luscus:

Sure, here are the steps:

1. Go to “Settings” in the account menu.
2. In the sidebar where it says “Blogs,” click on the blog you want to back up.
3. You’ll see the page that lets you edit the appearance of the blog, etc. At the bottom, you should see a button that says “Export blog.” Click that.
4. Tumblr will now take a shitload of time to create the backup (hours, or maybe even days if your blog has a ton of media posts) but eventually it’ll send you a link to download the backup. You don’t have to keep your browser open for that time, by the way.
5. Once you’ve got the link, click it and download! It should give you a ZIP file with a folder of HTML files for the posts and a folder for the media files.