I will make this quick and simple. As we've known for years now, this website could go down any day. In fact, just recently the domain for the Spanish server, hammerfest.es, has expired.
In order to not lose all your account progress when the same thing eventually happens here, I highly recommend everyone to back up their accounts on EternalTwin as soon as possible (Yes, account backup works again). The process is not complicated and only takes a couple minutes at most.
Here is a step-by-step guide on how to create an account backup:
1) Click "Sign in" on eternal-twin.net.
2) Select "Sign in with Hammerfest".
3) Choose the server and log in with your Hammerfest credentials.
If you wish to link an account from another server to your EternalTwin account:
4) Go to "Settings" on EternalTwin.
5) Scroll down to the section "Linked accounts".
6) Enter your account details and click the button to link your account.
After that, simply logging in again will update your data. I recommend doing this in regular intervals or after you've gotten a good achievement in the game.
This backed up data won't be of any use for you now, but when the official Hammerfest servers are gone one day, you will eventually be able to play with your old account progress on eternalfest.net.
Another thing I can greatly recommend is to join our Discord server, as there may be no way to find it anymore once Hammerfest is offline.
I'm gonna leave you with the most important links to get you up to date if you've been away from the game for a while.
If you've got any questions, feel free to ask. I will usually respond in a few days maximum.
fabianh 
