Backups can be performed to address disaster recovery needs. The backup copies are used for restoring data at an alternate site when the when the primary site is unavailable due to a disaster. Based on Recovery Point Objectives (RPO) and Recovery Time Objectives (RTO) requirements, organizations use different backup strategies for disaster recovery. When a tape-based backup method is used as a disaster recovery strategy, the backup tape media is shipped and stored at an offsite location. These tapes can be recalled for restoration at the recovery site. Organizations with stringent RPO and RTO requirements use remote replication technology to replicate data to a disaster recovery site. This allows organizations to bring up production systems online in a relatively short period of time in the event of a disaster.
Data in the production environment changes with every business transaction and operation. Operational backup is a backup of data at a point in time and is used to restore data in the event of data loss or logical corruptions that may occur during routine processing. The majority of restore requests in most organizations fall into this category. For example, it’s common for a user to accidentally delete an important email or a file to become corrupted, which can then be restored from an operational backup. Operational backups are created for the active production information by using incremental or differential backup technologies. An example of an operational backup techniques is a backup performed for a production database just before a bulk batch update. This ensures the availability of a clean copy of the production database if the batch update corrupts the production database.
Backups are also performed to address archival requirements. Although CAS has emerged as the primary solution for archives, traditional backups are still used by small and medium enterprises for long-term preservation of transaction records, email messages and other business records required by regulatory compliance. Backups also serve as protection against data loss to physical damage of a storage device, software failures or virus attacks. Backups can also be used to protect against accidents such as deletion or intentional data destruction.
The amount of data loss and downtime that a business can endure in terms of RTO and RPO are the primary considerations in selecting and implementing a specific backup strategy. Another consideration is the retention period, which defines the duration for which a business needs to retain the backup copies. Some data may be retained for years and some only for a few days. For example, data backed up for archival is retained for a longer period than the data backed up for operational recovery. It is also important to consider the backup media type, based on the retention period and data accessibility. The development of a backup strategy must include a decision about the most appropriate time for performing a backup (to minimize disruption), and the location and time of the restore operation must be considered, along with file characteristics and data compression that influences the backup process.
Types of Backup
• Full Backup: Exactly what it sounds like, the backup software will back up everything you tell it to back up.
• Differential: Only backs up what data has changed since the last backup.
• Incremental: Performs a full backup the very first time. It will then back up only data that changed since the last incremental backup, and will need ALL incremental backups to restore data.
• RSync: Only records bits and bytes that have changed since the last backup (for example, Delta Copy).
• Combined: Creates a full backup and then uses differential, incremental or RSync thereafter��(most backup software).
Examples of Server Backup Software
• Symantec NetBackup
• EMC Networker
• CommVault Simpana
• IBM Tivoli Storage Manager
• VBR from Data Trust Solutions (EMC Centera only)
• Altus from Seven Ten Storage (EMC Centera only)
Where to go from here
To speak with a Backup & Recovery specialist, call (631) 789-9595 or fill out our Information Request Form and a representative will call you back shortly