madth3: As I pointed out earlier, not all the issues in the bundle have DRM-Free backups. Unless they are unproperly marked in Comixology.
undeadcow: I can confirm that some of the Comixology issues are not yet DRM free; having purchased the bundle there's no accessible direct download link for titles like Chaos, Alice Cooper, Frankenstein, Dresden Files, Mercy Thompson, Red Sonja, Kirby, Monster War, Sherlock Holmes, Uncanny, Warriors, Green Hornet(s), Pathfinder...
It's possible that Comixology may add DRM free downloads at a later time.
There's a Chrome extension that scrapes the images from the web browser, and collects them as a CBZ file. It's simple to setup and use, and even integrates into the existing Comixology site. The images aren't as high-resolution as a native CBZ file, but it works great for being able to archive those comics lacking a DRM-free option.