I know it is very tough for one Gmail user to quit his account when his email inbox is full and he does n user who has lost hiso want to delete any email or for any Gmail password. So what shall we do to solve out this problem?

Gmail Backup is a software which will allow users to create a back up of their Email and they can also transfer it to a new Gmail Account or you can even access your mail on desktop too by using a desktop email client like Microsoft Outlook.

It also a good idea for corporate people. They can use it to backup email so that even if they lose their password or anything else happens you have it all safe. If your still not convinced you can read why you should backup your Gmail account here (from the developers of this software).

Thanks araravind.