A method of managing storage space of a storage device, wherein the storage device includes a plurality of snapshots of a file, includes the steps of: in response to a request to delete a first snapshot, determining a first amount of time that elapsed between a creation of the first snapshot and a creation of a second snapshot that is a child snapshot of the first snapshot: and after determining the first amount of time, executing a first process to delete the first snapshot over a first time interval, wherein the first time interval is based on the first amount of time.