You might have a great amount of emails in your Gmail or Google Apps account, and that will take Gmail Keeper a lot of time to run your backup job, and during the email backup process if your computer is put to sleep your backup might fail.
So how to solve this problem? Please download this Insomnia program from Microsoft, and run it when your email and label backup jobs are running, it will prevent your PC from going to sleep.
Review at lifehacker.com