Google will automatically delete Android backup if a phone has been inactive for 60 days. Interestingly, Google will not give any prior notification to the user before deleting the entire Android backup.
Tanglebrook, a Reddit user shared his own experience via a post, where he says he was not using his Android phone for two months and all his Android backup data, including all apps and setting was gone. He was shocked to see that Google did not send him any notification, alert or warning before deleting his backup. It was only when Tanglebrook contacted the Drive Support, he discovered that there is no option for recovery in spite of paying for the company’s service.
It must be noted that if a phone is unused for two weeks, Google Drive will display an expiration date below the backup, showing a countdown of how much longer you have until it gets automatically wiped.