AlexCroydon
As described in the docs above, inside your mailcow directory of course, run
MAILCOW_BACKUP_LOCATION=/path/to/your/backup/dir ./helper-scripts/backup_and_restore.sh backup all
And maybe copy it to a safe location afterwards, i.e. your NAS storage, feel free.
Just wondering, you’re running mailcow for your client and don’t have a backup in place yet?