Backing up your mail with POP

Here's how to download a copy of every message* in Gmail to an email client:
  1. Sign in to Gmail.
  2. Click Settings at the top of any Gmail page, and open the Forwarding and POP/IMAP tab.
  3. Select Enable POP for all mail (even mail that's already been downloaded).
  4. Click Save Changes.
  5. Open the mail client you've configured for Gmail, and check for new messages.
Gmail messages are downloaded in batches, so it may take time for everything to appear in your mail client.

* Messages in Spam and Trash aren't downloaded unless you move them to your inbox or All Mail.