A point-in-time snapshot is a copy of a storage volume, file or database as they appeared at a given point in time and are used as method of data protection. In the event of a failure, users can restore their data from the most recent snapshot before the failure.
By submitting your personal information, you agree that TechTarget and its partners may contact you regarding relevant content, products and special offers.
Many point-in-time snapshots are read-only. There are two main methods of keeping point-in-time snapshots up to date with changes:
- Pointer remapping -- When new copies of a point-in-time snapshot are made, the more recent copy will maintain a mapping to the original copy.
- Copy-on-write -- When changes are made to data, only the data that is modified will be copied again, rather than make another full copy of the data set.
Point-in-time snapshots are beneficial because a user can select a specific time they want to restore data from.