No1-tutorial: Types of Backup

Backups are generally divided into the following categories.

Full backup
Differential backup
Incremental backup
Delta backup
Logging

Full Backup

A complete set of all files you wish to back up. Think of this as your 'reference set'. You only need perform a full backup occasionally.The goal of full backup is to make a true copy of the data to be backed up on a separate medium like DVD ,CD etc... Because of large volumes of data, full backup can be slow and can cause availability problems because it creates long and intense and even expensive access disks, given the capacity that is necessary.

Incremental Backup

Incremental backup is a backup of those files which have changed since the last backup of any type.. This type of backup is more effective than a full backup because it focuses specifically on the modified files with a weaker storage space but, on the other hand, requires having previous backups in order to restore the full backup. Makes the job of restoring files fiddly, as you have to reinstall the last full backup first, then all subsequent incremental backups in the correct order; also makes it hard to locate a particular file in the backup set.

Differential Backup

Differential backup focuses specifically on the files that have been modified since the last full backup, which makes this backup slower and more expensive in storage space than an incremental backup but also more reliable because on the full backup is needed to restore the backed up data. Redundant information stored, because each backup stores much of the same information plus the latest information added or created since the last full backup. Subsequent differential backups take longer and longer as more files are changed