NetApp
7-mode/HA pair/V-Series : Volumes : Snapshot management : Understanding Snapshot copies : What a Snapshot copy is

What a Snapshot copy is
A Snapshot copy is a read-only image of a traditional volume, a FlexVol volume, or an aggregate that captures the state of the file system at a point in time. Snapshot copies are your first line of defense to back up and restore data.
For information about traditional volumes, FlexVol volumes, or aggregates, see the Data ONTAP Storage Management Guide.
Data ONTAP maintains a configurable Snapshot copy schedule that creates and deletes Snapshot copies automatically for each volume. Snapshot copies can also be created and deleted manually.
You can store up to 255 Snapshot copies at one time on each volume.
You can specify the percentage of disk space that Snapshot copies can occupy. The default setting is 20 percent of the total (both used and unused) space on the disk.
Parent Topic: Storage node