snapshot:    1. A fully usable copy of a defined collection of data that contains an image of the data as it appeared at the point-in-time at which the copy was initiated. A snapshot may be either a duplicate or a replicate of the data it represents. 2. The CIM_Snapshot class - An optional construct that can be used to represent a storage extent that contains either a full copy of another storage extent or the changes to that extent (in the case of a delta before or delta after copy). A CIM snapshot is not equivalent to a volume or file-based snapshot, or a point in time copy. It represents storage used to hold a copied image of an extent, or to hold changes to an extent.

See also: TBD