Database Reference
In-Depth Information
Types of backups
There are several types of backup policies that can be considered before including them in
the disaster recovery plan of your organization. This decision is solely based on the organ-
izations, requirements on how they would want to manage their data. The following are a
few of the different types of backups:
The full backup : A full backup involves archiving all data from the source loca-
tion to the target backup location. Almost all backup solutions start with the full
backup first and subsequently tend to use the other backup methods. Recurring
schedules for full backups are only done on smaller amounts of data. Performing
full backups on every schedule for large volumes of data is not advisable as such
backups can be very time consuming and would demand larger storage spaces.
The incremental backup : Incremental backups involve the archiving of only the
changes made to the data since the last backup. The first incremental backup is
preceded by a full backup and subsequently when data is changed or added, only
the data that has changed/added is backed up. Restoring data from incrementally
backed up data can be slower as it involves the process of first restoring the initial
full backup and subsequently applying the incremental restores on top.
The differential backup : The differential backup involves archiving only the
changes made to the data since the last full backup. The important term to note
here is full backup . This is what sets differential backups apart from incremental
backups. Restoring from differential backups is faster than restoring from incre-
mental backups.
The mirror backup : Mirror backups involve the duplication of every operation in
the source location to the target location. So in this case, when data is deleted in
the source, it is also deleted from the target backup location, maintaining a mirror
image of the original data. Using this type of backup could result in loss of data
from the backup location in the case of an accidental deletion from the source loca-
tion.
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