Is there a way to download all of my gamedata?

I'm looking to move a rather large game I've setup o Roll20 out to a campaign setting document so I can do prep work offline. I know i can go in and download them file at a time, but i have a LOT of lore and city/town/shop handouts. I'm not above doing it one file at a time, but I'd love a way to mass download all of it. I don't even care about the art if i'm being honest, or even the characters. It's the handout work i'm looking to snag. Thanks in advance!

There is not a built-in feature for that. I believe that downloading all of your Handouts as text, might be possible with the Mods (API scripts).  You could ask in the Mods sub-forum and I would be quite specific, "How to download the text of my Handouts in bulk" because saying gamedata is too broad. 

However there is an External Journal feature on Roll20 that might be a way to go-about this.  On your Game Details webpage > Content > External Journal From there you can open each Handout as it's own webpage tab in your browser. And potentially save all those HTML pages as text (with a browser extension, or by hand one at a time). 

I would probably go the external journal route. You can likely find an extension tagged will download linked pages as offline html or pdfs. Depending on what you're putting it in (I use Scrivener for building my world bible), you can likely import those files directly.