Thanks to the patrons which already supported just within one day and also thanks to donations made to Hashes.org. I much appreciate your support.
The first step of the recovery is completed, the server is set up and the files (without the backend) are back available, reflecting the state they had before the server had to be taken down. This currently is available under https://temp.hashes.org. Keep in mind that the website is in a restricted state, so things might not work as expected or functions are not available. They will come back when the backend finally is ready again then.
The next step will be the most time consuming, so don't expect the backend being fully available again just within a few days. I will keep you updated about the progress.