The Datto Knowledge Base provides a wealth of information about all things related to Datto. In this popular post from the Knowledge Base, we provide a detailed step-by-step explanation of how to import Gmail MBOX exports.
Restoring the emails from the export back in to Gmail can be done but requires the use of 3rd party applications to import the archived MBOX file back into Gmail. The export that you receive from us will contain an MBOX file for each label that you have backed up from Gmail. The 'AllMail' MBOX file will have all your Gmail records in it. Please follow the below steps to restore all emails from an MBOX file back into your Gmail account.
Setup your Gmail account with Thunderbird
Install "ImportExportTools" Add-On for Thunderbird
Extract the zipped up email archive file provided to you
Import the emails from the MBOX file for the label that you want to restore
Copy the imported emails into your Gmail Account
Once this is completed then you can log in to your Gmail account online and you should see all of the emails restored to the label that you chose in your Gmail account.
For a more-detailed guide as well as more information including user guides on all Datto products, head over to the datto Knowledge Base.