DesolateMood

I run vaultwarden local only and use https, mostly because vaultwarden doesn’t allow itself to be run over http. The way I did it was to get a domain (you can buy one if you want, I used duckdns for a free one) and when prompted for an IP to point it to, use your server’s internal IP instead your public IP. Other than that you should be able to follow all the guides as normal

Haven’t used KeePass so can’t give a direct comparison, but to answer your question, yes as long as you don’t log out of your client bitwarden will keep a local copy until it can be synced