backup types

(redirected from delta backup)

backup types

There are two categories of backup: system backup and file backup. System backup copies everything verbatim on the hard drive onto an external storage medium, including the operating system, applications and data. If the drive fails, the computer can be restored to its former state.

File backup copies only data files onto an external storage medium. If the drive fails, the OS and applications have to be re-installed. Following are the various types.

Full and Differential Backups
A full backup copies all selected files. A differential backup copies only files that have changed since the last backup.

Incremental and Delta Backups
When each revision of a file must be maintained, an incremental backup appends selected files to the backup medium and does not replace existing backup files. A delta backup is similar to an incremental backup but copies only the changed data within the selected file, not the entire file (it backs up the differences). See deduplication, backup software and cloning software.
References in periodicals archive ?
Asigra's block-level delta backup and deduplication makes backup and restore times the fastest on the market, regardless of the connection speed.
Support for Delta Backup -- Double Take's automatic replication feature ensures that only incremental file changes are backed up, significantly reducing backup processing time and network traffic by updating only the actual changes made to files versus copying the entire file.
Given that the typical BYOD device has at least 8GB of on-board flash memory (some go up to 64GB), any backup is going to be several gigabytes in size; delta backups will be in the hundreds of megabytes.
Simplified automatic restore from incremental or delta backups