1. To the old Datto, you need to assign a new vlan 20 IP so this one can communicate to the old one. Go to Configure – Network Settings and update there the IP to a new vlan 20 IP that nothing else is using. At this point we would lose connectivity to the appliance over the network.

2. Connect the new Datto appliance to vlan 20 and turn it on. Make sure that the network cable on the back is connected to the left side port, from the two together.

3. Once the appliance is on you need to assign the 20.15 IP address that the old appliance was using. To do that, use these instructions.

A. Press Ctrl+Alt+F1 to go to the back end of the device.
B. Once it asks for a login use:
UN. backup-admin
PW.  metal2095
C. Enter command: sudo -i
This should change the prompt to root.
D.  Enter command. nano  /etc/network/interfaces
E. Modify the network information from here. Make sure that ‘auto eth0’ is set to static. It should look as follow, with Your Network Info.
auto lo
iface lo inet loopback
auto eth0
iface eth0 inet static
auto eth1
iface eth1 inet manual
F. After editing the information, press Ctrl+X to close the editor, then press Y, Enter, to save the changes.
G. Back at the command prompt, write:            /etc/init.d/networking restart
H. When it completes enter the command:            checkin
If everything is correct, the machine should load a bunch of instructions here.
4. After the checkin is complete, press Ctrl+Alt+F7 to go back to the GUI.
5. At this point the system should be giving you a wizard to run some updates for the device, which will restart after, and then it will ask to register the device.
For the registration part, enter the device name. Create the username and password as you like. And enter the contact information for the property. At the end  select the box allow third party installers.
6.Once the registration is complete, restart the Datto appliance.
Then we need to confirm that we have remote access to the new appliance, and Datto will join us to try to connect to the old appliance over the back end, using the new IP assigned, so they can start the device migration.
For your information the process of the migration will take a day or so to run and while it’s running the backups won’t be able to run.