Tumblr blog backup utility
You can download a single post or backup the whole blog. If you backup a blog, you can choose to go with a full backup, an update, and a check. Update will start processing the latest post and stops when the post to be downloaded already exists. Either a full or an update backup is interrupted, or you accidentally deleted a post, run check mode: it skips the existing posts but doesn't stop at the first found instance.
JavaFX application for Desktop, compiled with JDK 10.0.2. Version 4. Open source.