Backup types & Restoration

Back up types

Ø Normal

Ø Copy

Ø Incremental

Ø Differential

Ø Daily

1.    Normal Backup: It is a full backup backs up all selected files & folders after back up removes the Archie bit (A)

Achieve Bit: It is a bit used by backup utility to know whether a file is backed up.

It is used as a backup marker.

2.    Copy backup: Copy backs up all selected folders but does not remove archive bit after backing up. Copy is used between normal backup and incremental backup.

3.    Incremental backup: backs up all selected files & folders which are changed since backup marks the files as having been backed up. Removes the archive bit after back up.

4.    Differential backup: backs up all selected files & folders. After backup does not remove the archive bit. It backs up all the files changed since normal back up.

5.    Daily backup: it backs up all selected files & folders created or changed during the day after backed up does not remove the archive bit.

Restoration

There are two types of restoration

Non-authoritative restore

Authoritative restore

Restoration of system state data can be done either authoritative or non authoritative

Non-authoritative restore is a normal restore useful when we have only one DC in the network. It does not increment the USN values of the objects after restoration. It uses older USN values only.

1. Authoritative restore: This is useful when we want to restore a specific object or specific object by incrementing the USN value.

Useful when we have multiple DCs in the N/W.