Incremental Backup Definition
An incremental backup is defined as a security copy that contains files that have been altered since the last backup. There are several types of incremental backups, including byte-level incremental backup, block-level incremental backup and incremental forever backup. Below, we go into more detail about incremental backups to help you understand the full definition.
Full Backup vs. Incremental Backup
As the name suggests, a full backup is a complete backup of every file you wish to backup. Since a full backup only requires one set of backup data, restoration occurs quickly, but can have high storage requirements.
Unlike full backup, incremental backup copies the parts of files that have changed since the previous backup, saving valuable time and storage space.
Types of Incremental Backups & Their Definitions
According to Computer Weekly, incremental backups copy all of the files that have changed since the last backup was made. They do this whether the last backup was a full one or an incremental copy. So if a full backup was done on day one, day two's incremental will back up all of the files that have changed since day one. Likewise, day three's incremental backup will only copy those files that have changed since day two's incremental took place."
Byte-level incremental backups help reduce the amount of computation required to determine duplicate data by monitoring individual bytes that have changed within a file system.
Block-level incremental backups are more efficient than file-level backups because rather than the entire file being backed up, only the changed blocks are backed up. According to TechTarget, "Each block acts as an individual hard drive and is configured by the storage administrator. These blocks are controlled by the server-based operating system, and are generally accessed by Fibre Channel (FC), Fibre Channel over Ethernet (FCoE) or iSCSI protocols."
- Incremental forever backups help ensure that you are only backing up what you have to during the backup process, because only blocks that have changed since the first backup are sent to the data center.
Continuous Backup From LOGICnow
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Computer Weekly: http://www.computerweekly.com/news/1347703/Incremental-vs-differential-backup-A-comparison