GMail services are very nice, but if you lose your GMail account,then you will be in serious trouble.
Note that: It is better to make a backup of your data.
Here is a program that can download and archive all your emails in your GMail (inbox, archived and sent (including attachments), with the exception of spam folder).
Prerequisite
Have a GMail account with IMAP enabled in the configuration
This document, titled « Archiving your GMail box », is available under the Creative Commons license. Any copy, reuse, or modification of the content should be sufficiently credited to CCM (ccm.net).
