First of all, this is not a request for help but something i wanted to share with everyone else because i won’t be the only one trying to achieve the same result.
Problems i’ve run into before:
While starting the bitwarden server on a new server with the backupped data it refused to work. Let’s Encrypt caused an error because it expected some symlinks to files that do not exist anymore. And if the i remove the data from the lets encrypt server the installation will boot but the web interface doesn’t work.
How to restore BWDATA to another server without problems:
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Install Docker and Docker Composer
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Run a new installation and use your old installation ID and key (can be found under bwdata/env/global.override.env from backup)
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Make sure to use the same domain and settings.
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When finished stop the service and copy you bwdata backup into the new bwdata folder except for the letsencrypt folder
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Now start bitwarden and everything should work correctly
