Instructions to update the IP address of a server:
- Over the Datto web portal, go to the Protect tab.
- Scroll down the page and find the server in question.
- Click on the Configure Agent Settings on the left.
- Scroll to the bottom of the page to the Rename Agent section.
- From there enter the new IP address or new hostname and click on Rename Agent. Then you should see the communication repaired and you should be able to start a new backup right away.