CertiGuide to A+ (A+ 4 Real)  9  Chapter 1: What are Operating Systems and How Do They Work?       9  Backup/Restore

Differential Backup Strategy 1 Windows Backup

Incremental backups only back up data that has changed since the last backup, regardless of that backup’s type. This strategy is very similar to a differential backup, except that the archive bit is cleared after each backup,

This is the fastest strategy for data backup, on the basis that only files changed since the last backup are backed up each time (whereas a differential backup backs up all files changed since the last full backup, through use of the archive bit). However, restoration of data is extremely slow and must be performed with great care. First, the latest full backup must be restored, after which every incremental backup taken since that full backup was completed must also be restored. In other words, if the last full backup was done two weeks ago and only incremental backups have been taken since, each incremental backup taken in those last two weeks must be restored consecutively.

Differential Backup Strategy 1 Windows Backup