To backup Gmail emails to PDF manually, go to Gmail and choose the emails you wish to save. Open each email, click on the Print icon, and select Save as PDF or Microsoft Print to PDF as the printer. Save the file to your preferred location. For multiple emails, use Google Takeout: go to takeout.google.com, choose Mail, customize settings, and export as PDF.
Alternatively, use an email client such as Outlook or Thunderbird to sync Gmail through IMAP, saving each email as PDF separately. This process is free but takes time for large backups.
As highlighted above, both the manual approaches and limitations regarding exporting emails from a Gmail account. To combat these issues, users can make use of the advanced DRS Softech Gmail Backup Tool that makes it easier to export Gmail emails to PST, MSG, PDF, EML, MBOX, AOL, Office 365, Thunderbird, Hotmail, and others, directly to a local drive.