Here is the solution to your problem. You can try the Gmail backup tool. It also supports the Windows OS like XP/Vista/10/8 (32 + 64 bit). This is the most reliable solution to your problem. The Gmail Backup is the light in weight that can easy to install and never make your computer slow. The software can easily provide a database of unlimited and big size files at the same time, without any data loss and without making duplicate files.
Visit here:- https://www.softwarewiki.org/backup-gmail/