Disaster recovery solutions ensure the high availability of enterprise data and services by combining disaster recovery with data backup. Disaster recovery protection levels are classified by risk and RTO/RPO.

Key technical indicators

Take the following key technical indicators for disaster recovery into account when designing your disaster recovery solution:
  • Recovery time objective (RTO): The period of time within which IT systems and services must be restored after an outage. RTO indicates the timeliness of service recovery, that is, the maximum recovery time for IT systems that enterprises can tolerate. A smaller RTO indicates a higher disaster recovery capability, but requires a higher enterprise investment.
  • Recovery point objective (RPO): The point in time to which data is restored by the disaster recovery system after an outage. RPO indicates the amount of data loss, that is, the maximum amount of data loss that enterprises can tolerate. A smaller RPO indicates less data loss and less harm to the enterprise.

Disaster recovery protection levels

According to the National Standard of the People's Republic of China GB/T 20988-2007 Information Security Technology - Disaster Recovery Specifications for Information Systems, the protection levels are determined as follows:
Protection level Data backup Measure Preventable risk RTO RPO
Level 1: Basic support
  • All the data is backed up once a week.
  • The backup media are stored offsite.
- The service data is damaged. Two days or more One to seven days
Level 2: Secondary site support
  • All the data is backed up once a day.
  • The backup media are stored offsite.
  • The data is regularly synchronized in batches several times each day.
Backups are called after an outage.
  • The service data is damaged.
  • The service processing site is not available.
24 hours or more One to seven days
Level 3: Electronic transmission and partial device support
  • All the data is backed up once a day.
  • The backup media are stored offsite.
  • The data is regularly synchronized in batches several times each day.
Backups are provided for some data processing devices.
  • The service data is damaged.
  • The service processing site is not available.
  • Some devices or networks fail.
12 hours or more Several hours to one day
Level 4: Electronic transmission and full device support
  • All the data is backed up once a day.
  • The backup media are stored offsite.
  • The data is regularly synchronized in batches several times each day.
Backups are provided for all devices in the available status (cold site).
  • The service data is damaged.
  • The service processing site is not available.
  • All the backup devices or networks fail.
Several hours to two days Several hours to one day
Level 5: Real-time data transmission and full device support
  • All the data is backed up once a day.
  • The backup media are stored offsite.
  • The data is replicated in real time.
Backups are provided for all devices in the ready or running status (warm site).
  • The service data is damaged.
  • The service processing site is not available.
  • All the backup devices or networks fail.
Several minutes to two days 0 to 30 minutes
Level 6: Zero data loss and remote cluster support
  • All the data is backed up once a day.
  • The backup media are stored offsite.
  • The data is synchronized and backed up in real time to ensure zero data loss.
  • The disaster recovery site and the production site have the same processing capability and are compatible with each other.
  • Software clusters are used to implement seamless failover and failback.
  • Real-time monitoring and automatic failover to the remote cluster system are supported (hot-active).
  • The service data is damaged.
  • The service processing site is not available.
  • All the backup devices or networks fail.
Several minutes 0

Key factors for disaster recovery

The core aim of a disaster recovery solution is to help enterprises balance the needs of RTO and RPO and find the optimal technologies and means of implementation. From an economic perspective, the solution helps enterprises optimize their Total Cost of Ownership (TCO) and Return on Investment (ROI).