The ECS Snapshot 2.0 data backup service provides a higher snapshot quota and more flexible automatic task policies than previous Alibaba Cloud snapshot services, further reducing its impact on the storage I/O performance.

Comparison of specifications

Note Disks in this topic refer to Cloud disks and Shared Block Storage. For more information, see Cloud disks and Shared Block Storage.
Feature Original snapshot specification Snapshot 2.0 specifications Benefit Example
Snapshot quota (Number of disks + 1) x 6 64 snapshots for each disk Longer protection cycle and finer protection granularity
  • The snapshot backup of a data disk for non-core businesses occurs at 00:00 every day. This backup data is retained for over 2 months.

  • The snapshot backup of a data disk for core businesses occurs every 4 hours. This backup data is retained for over 10 days.

Automatic snapshot policy Hardcoded, triggered once daily, and unmodifiable Can be customized for day of week and time of day snapshot creation, and for snapshot retention period. You can also query the disk quantity and details associated with an automatic snapshot policy. More flexible protection policy
  • You can take snapshots on the hour, several times a day.

  • You can select any day in a week as the recurring day for snapshot creation.

  • You can specify a snapshot retention period or retain snapshots indefinitely. When the maximum number of automatic snapshots has been reached, the oldest automatic snapshot will be deleted.

Implementation principle Copy-on-write (COW) Redirect-on-write (ROW) Mitigated impact of the snapshot task on storage I/O performance The implementation is invisible to users, allowing snapshots to be taken at any time without affecting user experience.

Technical comparison

Compared with the snapshot features of traditional storage products, ECS Snapshot 2.0 has the following advantages:

Item ECS Snapshot 2.0 Snapshot feature of traditional storage products
Capacity Unlimited capacity, meeting the data protection needs of extra-large businesses. Capacity limited by the purchased storage devices, merely meeting the data protection needs of core businesses.
Scalability Auto scale at one click in seconds to meet on-demand business scaling requirements. Poor scalability, restricted by such factors as the production and storage performance, available capacity, and vendor support capabilities. Scaling typically takes 1 to 2 weeks.
TCO Billed according to the actual snapshot size generated. Large upfront investment typically for software licenses, reserved space, and upgrade and maintenance expenses.
Usability 24 × 7 after-sales support (available in multiple languages). Complicated operations, greatly restricted by vendor support capabilities.