However, if there is no backup and the original data disk is damaged, the data cannot be recovered. Pointer-type snapshot takes up less space and have less impact on system performance. The other is called split-mirror snapshots, often called mirror-type snapshots. It is roughly divided into two types, one is called a copy-on-write snapshot, which is usually called a pointer-type snapshot, and VSS belongs to this type. ![]() The core of its working principle is to establish a pointer list, indicating the address of the read data, providing an image of the instantaneous data, and copying when the data changes. Snapshot is actually a reference mark or pointer to the data stored in the storage device, which is the state of the data at a certain moment. Snapshot, that is, snapshot technology, is widely used in backup.
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