How To Back Up Your Gmail
Gmvault Backs Up Your Gmail and Restores It to Any Gmail Account
>Windows/Mac/Linux: Although there are a bunch of ways to backup your Gmail, including really easy to use Windows app MailStore, cross-platform program Gmvault takes the cake for being feature-rich and highly customizable.
Gmvault not only backs up your entire Gmail account to disk, you can set it to run regularly to always keep your backup up to date (it's fast too; in the quick sync mode, it only updates the latest emails). You can restrict your backup to a set of certain emails based on a search request or date range and also encrypt the saved emails, which are stored in a Gmvault repository.