I found Mail Backup X tool as a solution.

Janepickles:
Yes, it is possible to backup your emails to any cloud storage such as one drive, google drive etc. I always backup my files to my cloud storage i.e. Google Drive but I use backup tools to do so because backup tools automatically backup my mails to my cloud storage.

Thanks for your suggestion but can you mention the backup tool which you are currently using.

I followed every step to backup my emails to Google Drive. But every time I failed and one time I lost my few files. I want to know if it is possible to backup my emails to Google Drive. If yes, please explain to me the procedure to do so.