Fundamentals of Backup and Recovery

The concept of backup and recovery is very simple. Data is copied to offline or secondary storage during backup operations and is kept there in case it needs to be restored following some type of disaster that causes the loss of data. Backup traditionally uses both duplication redundancy and delta redundancy with file granularity. In other words, legacy backup can copy all the files in a storage address space, or it can copy only those that have changed.

Historically, backup copies have been made to tape storage devices and tape media. In recent years, this scenario has changed somewhat with the introduction of less-expensive ATA disk drives. The use of disk for backup is discussed toward the end of this chapter ...

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