Where are the backup files

Hi everyone,

I have set up my google drive plugin for quite some time now, however i just got to realise that it has not been uploading to my drive since few weeks back.

Right now i need to restore my previous backup, where can i find this backups which are not uploaded to my google drive?

http://www.chuanjoo.com

http://wordpress.org/plugins/wp-google-drive/