Step 1: First of all, Download, Install, and Run Gmail Backup Tool on your macOS.
Step 2: Enter your Gmail email address and app password. Click the Sign In button.
Step 3: Here, the software fetches all the mailboxes your Gmail account has. Select the folders you need to back up and click the Next button.
Step 4: Note:- You can skip the All Mail Folder during the backup process; click Next.
Step 5: Go with the Save in file format option and select PST from the drop-down list.
Step 6: You can Skip Duplicate Emails based on To, From, Subject and Body.
Step 7: The Split PST File option allows you to break the resultant PST file based on size(MB or GB).
Step 8: Here, you have a feature to Migrate or Backup Emails Without Attachments files.
Step 9: The software also allows you to Free up Gmail Server Space during the backup.
Step 10: Date Filter will let you perform the selective backup of Gmail mailbox data.
Step 11: Click the Next button.
Step 12: The Save Path button helps you to set a saving location for the output folder.
Step 13: Click the Download button to download Gmail mailbox emails locally in PST file format.
Step 5: Choose the saving option as Migrate in Email Client.
Step 6: Select Office 365 from the drop-down menu.
Step 7: Enter your Office 365 email address and click on the Sign In button.
Step 8: Here, you will be redirected to the Web browser where you need to complete the login process.
Step 9: Date Range feature for performing the selective data migration from Gmail mailboxes to Office 365.
Step 10: It also allows you to Migrate or Backup Without Attachment from the email messages.
Step 11: Here, you can also Remove the Duplicate Emails from the selected folders.
Step 12: Free Up Server Space to delete the Mailbox data after migration.
Step 13: Choose Mailbox/Public Folder or Online Archive Option according to your requirements.
Step 14: Click on the Next button.
Step 15: In the next panel, click the Download button to start Gmail to Office 365 migration.
After downloading the Aryson Mac Gmail Backup Tool, you will find the welcome screen as played below.