This challenge can be found at Book Dragon’s Lair, here: http://www.bookdragonslair.com/2016/12/hosting-ebook-challenge.html
All books must be in electronic format, but it doesn’t matter what kind: Kindle, Nook, epub, pdf…you get the idea. They also must have an ISBN or equivalent. If you can buy it or borrow it, it counts. (Which means that online serials don’t, sorry…)
You can list your books in advance or as you read them. You can also change your list along the way.
Genre or length doesn’t matter, and crossovers for other challenges count (which is really good for people like me, who can’t seem to stop signing up for reading challenges…). Anyone can join in the fun, you don’t have to have a blog. You don’t even have to review the books, although doing so would be nice and really help the authors out.
The different levels are:
Bit: 1 book; Byte: 10 books; Megabyte: 25 books; Gigabyte: 50 books; Terabyte: 75 books; Petabyte: 100 books; Empty the Cloud: 101+ books.