Oh! A couple other tools that might be useful to you, depending.
The WordPress option: like I said, you can just set up a WordPress account, use the built-in Tumblr import tool, and point it at your Tumblr blog to copy all the Tumblr posts over to a WordPress blog.
Frostbox: this one comes with a subscriber fee, but it lets you back up all sorts of things, like various social media accounts (I don’t know if you can move them between accounts): http://www.frostbox.com/this-is-frostbox
Backup Jammy: This one just snags all your Tumblr posts and turns them into an HTML file that you can save, so you can just keep them on your hard drive. http://boutofcontext.com/tumblr_backup.php
A few tools that let you back up various files from your account to save them on your hard drive: http://tumblring.net/how-to-backup-your-tumblr-blog/
The thing is that most of the backup tools just link to videos and images and stuff. So if you actually want to keep them (in the event of, say, Tumblr deleting something), you have to back them up some other way.
BUT this also turns out to explain what’s up with all those art reposter accounts. Because what the image backup apps do is, you just point them at a blog and then it scrapes all the images and saves them in a folder on your computer. So then they’re just…there. And if you’re the type of person who does this, you could simply dump them back onto your art-reposting blog.
Updates from a user:
arriejohnson replied to your post:
also the tumbling link sends you to a straight scam redirect which alternates each time a user clicks it…
arriejohnson replied to your post:
the boutofcontext tumblr back up thing IMO doesn’t work as it said it would
Sharing for reference. I’m not surprised that some of these have broken or moved. I wrote this post a year ago.
Following is a list of updated options for Tumblr backup as of July 2016. KEEP IN MIND I HAVEN’T NECESSARILY TRIED THESE, but you can give them a whirl and let everybody know what you think.
Backing up Tumblr to WordPress–my preferred method after testing a bunch of other options: https://prettyarbitrary.tumblr.com/post/147697792635/how-to-back-up-your-tumblr-to-wordpress
Note: Somebody recently dropped me a note saying that their WordPress was promptly deleted when they tried this. But I don’t know if they followed the instructions about setting it to private or not. That’s really important. WordPress.com does crack down on public duplicate blogs. They’ve got no problem with their service being used as backup, as far as I can tell, but they seem to have little tolerance for what looks to them like rip-off artists.
Note the second: In the event that WordPress.com is being a chump to you, I have added information about setting up your very own free WordPress installation on your home computer or personal webspace. Just keep scrolling down that longass post and you’ll get to it.
Python script from GreyMask: This comes highly recommended from a number of quadrants online. I come across it again and again as a response to rec posts, and people always seem to be happy customers. It’s easiest to use on Mac. Using it on Windows requires a bit more technical knowledge or at least a can-do attitude and a fair amount of patience. (If you do this, read the comments, because the developer left some notes regarding updates since the code was originally compiled.)
Backup to a site called Revert: Follow this one at your own risk. It could be great, but I’m noticing a few potential warning signs. I explored this one just a little, and the first thing I discovered is that the website didn’t look like anything I was expecting. A quick bit of research showed that Revert recently changed their name to ThisData, and they are a bona fide startup with investment money and a CrunchBase profile (although that doesn’t necessarily stop a startup from being shady or half-assed, so take that as you will). Also, as of July 20, 2016, their site’s security certificate has been expired for about two months, so attempting to visit the site may throw up a security warning. I chose to go forward anyway just so I could look around (the next step was an authentication window, and I didn’t make an account so I can’t tell you more), but if they don’t fix that pretty soon then I’d say that’s a bad sign for the site’s functional future.
That’s most of what I see out there. If you know of something else, feel free to share!