What Are the Differences Between Backups and Snapshots?¶
Both backups and snapshots provide data redundancy for disks to improve data reliability. Table 1 lists the differences between them.
Item | Storage Solution | Data Synchronization | Service Recovery |
|---|---|---|---|
Backup | Backup data is stored in OBS, instead of disks. This ensures data restoration upon disk data loss or corruption. | A backup is the data copy of a disk at a given point in time. CBR supports automatic backup by configuring backup policies. Deleting a disk will not clear its backups. | You can restore backups to their original disks or create new disks from the backups. |
Snapshot | Snapshot data is stored with disk data. Note Creating a backup requires a certain amount of time because data needs to be transferred. Therefore, creating or rolling back a snapshot consumes less time than creating a backup. | A snapshot is the state of a disk at a specific point in time. If a disk is deleted, all the snapshots created for this disk will also be deleted. If you have reinstalled or changed the server OS, snapshots of the system disk are automatically deleted. Snapshots of the data disks can be used as usual. | You can use a snapshot to roll back its original disk or create a disk for data restoration and service recovery. |