Hi, this is Varun, the creator of Quickz
Unfortunately, the home server where I host Quickz (and a ton of my other services is down).
All of the data is safe, this is purely a networking issue. (and I have backups available on hand, so if you need a JSON export of your decks or something urgently, let me know and we can work something out)
The next time I'll be home to fix it will be in a month from now! (end of April 2026)
I am really sorry about the inconvenience.