Set up the pi for your environment
ssh pi@
sudo raspi-config
Set the timezone, country, wifi country, language, unset GB-UTF8
sudo apt-get update && sudo apt-get -y upgrade
sudo apt-get -y autoremove
sudo apt-get -y install screen
wget -O - | sudo bash

Open admin:openmediavault
Storage / Disks - Erase both drives.
Storage / File Systems - Create ext3 fs on both drives. Enable monitoring.
Storage / SMART / Settings - Enable temperature warnings
Storage / Shared Folders - Create a shared folder
Users / Settings - Enable User home directory
Users / Users - Create users (If you're going to use SMB, must match Windows Users
Users / Groups - Add users to groups as needed
Services / NFS / Shares - Add the Shared folder
Services / SMB/CIFS / Shares - Add the Shared folder
Services / SMB/CIFS / Settings - Enabled,
Services / Rsync / Tasks - Create rsync service to backup one drive to the other.