Gmail Backup Tool Frequently Asked Questions

Connect Gmail, select labels, choose PST (Unicode) and click Start Backup. Full steps: Back up Gmail to PST

No. You sign in on Google's own login screen in your browser, so you do not type your Google password into the app, and you do not need to turn off 2-step verification. After you approve access, the app stores an OAuth refresh token on your computer so the session can be renewed. You can revoke access at any time in your Google Account permissions.

Select PDF Document as the destination in the destination step. Check a sample in the free trial first. Destination step

Prism uses an embedded SQLite ACID transaction checkpoint database (prism_gmail_checkpoint.db). If your connection drops or your computer restarts, simply relaunch the tool and click Resume. It verifies previously downloaded Message-IDs and continues downloading only the remaining emails.

Yes. Prism Gmail Backup Tool is distributed as a Universal Binary running natively on Apple Silicon (M1, M2, M3, and M4) as well as legacy Intel x86-64 Macs and 64-bit Windows 11/10 without requiring Rosetta emulation.

Yes. Select Microsoft 365 as your output format. Authenticate with your Microsoft 365 account via Modern Auth, and the engine streams your Gmail emails, folders, contacts, and calendars directly into your Microsoft 365 primary mailbox or Online Archive.

Google Takeout takes 24 to 72 hours to compile archives, chops large accounts into dozens of fragmented 2GB zip files that frequently expire during download, and only outputs raw MBOX format that Outlook cannot open. Prism downloads immediately straight into Outlook PST, searchable PDF, or EML on your local drive.

Yes. When you connect your Google account, the tool discovers your Google Contacts and Calendars alongside your email labels, exporting them to standard vCard (.vcf), iCalendar (.ics), or importing them straight into Microsoft 365.

The software uses a chunked streaming buffer (64KB chunks) that iterates through messages sequentially in RAM without attempting to load the entire archive into memory.

Yes. In Step 3 (The Filter Engine), check Skip Spam & Trash Folders to bypass [Gmail]/Trash and [Gmail]/Spam, saving local disk space and reducing backup duration.

The free trial version allows you to download and export up to 50 items per folder/label across supported formats, letting you test speed, label reconstruction, and attachment integrity before purchasing a license.

Yes. Enable the Auto-Split Large PST option in Step 4 and choose your threshold (2GB, 5GB, 10GB, 20GB, or 50GB). The software dynamically creates sequential PST files (Gmail_part1.pst, Gmail_part2.pst) without breaking email threads.

Following successful payment, your digital license key is delivered to your billing email address. If you need your key resent or require assistance with activation, you can contact our team anytime via our Contact Support page.

We provide free evaluation versions for all tools so you can test compatibility and conversion fidelity on your own data before buying. If you encounter a verified technical limitation or defect that our engineering support team cannot resolve, purchases are covered under the terms detailed on our Refund Policy page.