differential backup

differential backup

[‚dif·ə‚ren·chəl ′bak‚əp]
(computer science)
Backup of only files that have been changed or added since the last backup.

differential backup

(operating system)
A kind of backup that copies all files that have changed since the last full backup. Each differential backup will include all files in previous differential backups since the full backup so to restore a version of a file, you only need to search the full backup and the relevant differential backup.

Some systems support differential backup by associating an "Archive" flag with each file and setting this flag whenever the file is modified to indicate that it should be included in the next backup. A differential backup does not change this flag, whereas an incremental backup resets it.
References in periodicals archive ?
An incremental image copy backup, sometimes referred to as a differential backup, contains only the data that has changed since the last full or incremental image copy was made.
Changes made while running virtual machines from backups are saved as differential backup files.
Start a virtual machine from an ActiveImage Protector full, incremental or differential backup image.
Bacula Systems said that the plugins includes Delta plugin, which uses signature-based file difference, for backing up large binary files; VMware plugin, with raw level backup via NBD or SAN that removes the necessity to install a File Daemon on each guest; SAN Shared Storage plugin, which optimizes and increases tape library usage by providing shared access to tape drives; Microsoft SQL Server VSS plugin, which performs differential backup and allows restore at the database level; and Microsoft Exchange VSS plugin, that performs incremental backup and allows restore at the mailbox level.
According to the company, the software can help users to comprehensively backup network data, including schedule backup, full backup, incremental backup, differential backup into local hard drives, external hard drives, CD/DVD, tape device and other storage devices.
Under the simple recovery model database can be recovered only to a point when last full or differential backup was taken.
A full backup now takes a day less and a differential backup is speeded up each day by a few hours.
Differential Backup Method: A differential backup copies all those files that have been modified or changed since the last full backup.
8226; Complete, Incremental, and Differential Backup
With a more user-friendly interface and many new advanced functions like SQL and Exchange backup, and differential backup, EaseUS Todo Backup 3.
This minimizes the amount of data backed up each time and therefore reduces the amount of time needed for the "backup window" making it different from differential backup.
The speed is provided by a unique differential backup scheme: only the changes in files are sent to the store, not all files.

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