Maybe surprisingly, it is actually a technique to limit interruptions, specifically because you are only working on your current task for 25 minutes. It makes it much easier to not switch tasks in the middle because your next time to switch tasks is less than 25 minutes away. For example, if you’re in a task writing a report and you remember that you were supposed to send an email, you write down the email task to do later and don’t worry about it because if it’s important than you will pick it for your next pomodoro. This allows you to stay focused on the report you’re writing for this pomodoro.
https://github.com/rsmsctr/vaultwardenGuide
It doesn’t cover backups though. It uses Caddy instead of NGINX, and it uses DuckDNS to point a subdomain to your private IP address of your Vaultwarden server, so it will only be accessible in your LAN.