From their guestbook:

earlgrey wrote at Tue, Jul 09 2019, 20:56 (utc) following comment: Hello world. Yes it is true. No backup because they got a hold of this drive also. And no one never ever would have expected bullshit like this... We received an answer from the Hacker... Hacker #1 because there is another one in the game ?!?! Stupid kids-stuff ... hope they realize and come down to earth please read the answer: "Good day. Yes, your files have been encrypted with our crypt. but another hacker has encrypted your files on top. Now on your files are two crypts. you need to contact first with another hacker and agree to decrypt your files. Then we can already help you."