Around 600,000 users were thought to have been affected, with Google spending several frantic hours trying to restore the service used by an estimated 200 million people, the Daily Mail reported.
Google said 0.08 percent user email accounts were affected by the glitch. The company said its Gmail users complained that their entire email accounts, including every email, application, contact and calendar information, were deleted.
A Google worker called Michelle posted a message saying: "We're looking into this issue right now. I know how important your messages are to you. Thanks for reporting on the forum."
On Sunday a Google spokesman told the Huffington Post: "We've already fixed the problem for some individuals. Our engineers are working as quickly as possible and we hope to have everything back to normal soon. We're very sorry for the inconvenience to our customers."