Shadow copy is a backup technique in which Windows automatically backs up files and folders to a reserved spot on the same storage drive following the administrator's preferences. The default storage capacity is 64 copies. It's impossible to initiate the shadow copy backup until this service is started. The Windows 2003 Server+ operating system is where you can find it for the first time. With a shadow copy backup, even files in use during the backup are preserved. Just a copy of the current file system is saved. At the same time, simple backups are performed outside of normal business hours. It happens in person and online. Scheduled backups are created on many media, including san, nas, tape drives, physical hard drives, etc.