Types of backup and system state backup

Types Of backup

Back-up is the operation done to prevent data loss. The principle is to make copies of particular data in order to use those copies for restoring the information if a failure occurred (a data loss event due to deletion, corruption, theft etc.). The back-up can be done manually (copying the data to a different location) or automatically using a backup program

Each program has its own approach in executing the backup.

Copy backup

A copy backup copies all the files you select, but does not mark each file as having been backed up (in other words, the archive attribute is not cleared). Copying is useful if you want to back up files between normal and incremental backups because copying does not affect these other backup operations.

Daily backup

A daily backup copies all the files that you select that have been modified on the day the daily backup is performed. The backed-up files are not marked as having been backed up (in other words, the archive attribute is not cleared).

Normal backup

A normal backup copies all the files you select and marks each file as having been backed up (in other words, the archive attribute is cleared). With normal backups, you only need the most recent copy of the backup file or tape to restore all of the files. You usually perform a normal backup the first time you create a backup set.

Incremental Data Backup

Incremental backup processes only files that appeared or changed since the previous backup. Say, you created a task for backing up my documents folder. If you do an incremental backup immediately after a full backup, no files will be copied. But as soon as some files get modified, or new files are created, an incremental backup will process all modifications

Differential Data Backup

Differential backup is very much like incremental backup, with the only difference that it doesn’t update the index file with each task execution, and therefore each task execution processes all modifications since the last full backup. This approach requires more disk space, as each differential backup is of the same size or larger than the previous one, but enables faster restoration of data, as compared to incremental backup.

Full backup

Full backup assumes that each time you execute the task, the entire set of data is copied to the chosen place. This type of backup takes the most disk space, time and PC resources, and often does a lot of senseless work. This backup all the selected files and folder you have selected every time.

　

Note : To take the Incremental backup, You always have to take the Normal backup first.

As we are going through the backup I will just quickly gothough the "what is the System state backup and what is included in system state backup"

The Windows system state backup is in effect a backup of the complete system. Everything that is present within the system will be copied as backup so that no data or information is lost whenever there is a system crash or corruption of the driver files, if certain system files stop the system from functioning properly.

A full system state backup saves the:

• Active Directory (NTDS),


• Windows Boot files,


• COM+ class registration database,


• Registry,


• System volume (SYSVOL), and


• The IIS metabase.

　

　

These are basic types of backup. There are many applications available in the market which provides different types of backup like Deduplication which is again ahigh tech backup process.