Tuesday, 20 November 2012

Incremental backup in Mac

What is incremental backup? 
Incremental backup backs up only that data which has been changed since the last backup.”

Incremental backups consume minimum storage space to keep your data. The purpose of an incremental backup is to preserve and protect data by creating copies and it minimizes the amount of time needed to perform the backup. As an example, Monday backup keeps only those files that changed since Sunday.

Types of incremental backup?

When you keep backup in multiple level, a full backup is level 0. A level n backup will keep back up of everything that has changed since the most recent level n-1 backup.

Block level:-
This method backs up only the blocks within the file that changed since last backup. A high level of integration needed between sender and receiver. 

Byte level:-
It keeps backup of bytes that changed at last backup, the byte-based technologies work with the minimum unit, saving space when reflecting a change on a file. 

Another backup Methods:-

It keeps the backup of all changes made since the last full or normal backup. It helps to recover backup quickly. The disadvantage is that for each day elapsed since the last full backup.

Full backup:-
When you set the Backup Type setting to Full, all the files and folders on the drive are backed up every time.

Advantages of incremental backups:
  1. It is the fastest backup type since it only backs-up increments.
  2. It saves storage space compared to other backup types.
Back up tool in Mac:- 

Time Machine - It is an inbuilt utility of Mac which helps to keep incremental backup of Mac data. Time Capsule is used with Time Machine to keep data.

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