Create backup documentation

General-(not-docker).md

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+## Backup
+
+Things to include in your backup:
+
+- The environment file used when starting Vaultwarden
+- The `data` directory
+- The Vaultwarden database
+  - SQLite database is stored in the `data` directory by default
+  - Use the database backup features of MariaDB/PostgreSQL/MySQL to create a backup
+
+Make sure you document the procedure and locations where backups are stored!
+
+## Restore
+
+- Install Vaultwarden
+- (Not for SQLite) Restore your database from backup
+- Restore the environment file
+- Restore your `data` directory to the correct location
+
+## Platform specific
+
+### FreeBSD port
+
+| Item        | Location |
+|-            |-         |
+| Environment | `/usr/local/etc/rc.conf.d/vaultwarden` |
+| Data        | `/usr/local/www/vaultwarden/data` |
+
+### MariaDB / MySQL
+
+See e.g. [MariaDB - Backup and Restore Overview](https://mariadb.com/kb/en/backup-and-restore-overview/)