Google Takeout is the most efficient way to backup Gmail emails offline. Follow the steps below to create an offline Gmail backup.
Step 1. Visit the website: Google Takeout.
Step 6. Google will offer you multiple delivery methods, including Send download links via email, Add to Dropbox, Add to OneDrive and Add to Box, Add to Drive.
After a time, Google will send an offline download link to your Gmail. You just need to download and store it in a safe place.
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