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Question: What is Mirror Backup ?

Answer: Mirror backups are as the name suggests a mirror of the source being backed up. With mirror backups, when a file in the source is deleted, that file is eventually also deleted in the mirror backup. Because of this, mirror backups should be used with caution as a file that is deleted by accident, sabotage or through a virus may also cause that same file in mirror to be deleted as well. Some do not consider a mirror to be a backup.

Many online backup services offer a mirror backup with a 30 day delete. This means that when you delete a file on your source, that file is kept on the storage server for at least 30 days before it is eventually deleted. This helps strike a balance offering a level of safety while not allowing the backups to keep growing since online storage can be relatively expensive.

Many backup software utilities do provide support for mirror backups.

Advantages
The backup is clean and does not contain old and obsolete files
Disadvantages
There is a chance that files in the source deleted accidentally, by sabotage or through a virus may also be deleted from the backup mirror.

Mirror backups are as the name suggests a mirror of the source being backed up. With mirror backups, when a file in the source is deleted, that file is eventually also deleted in the mirror backup. Because of this, mirror backups should be used with caution as a file that is deleted by accident, sabotage or through a virus may also cause that same file in mirror to be deleted as well. Some do not consider a mirror to be a backup.

Many online backup services offer a mirror backup with a 30 day delete. This means that when you delete a file on your source, that file is kept on the storage server for at least 30 days before it is eventually deleted. This helps strike a balance offering a level of safety while not allowing the backups to keep growing since online storage can be relatively expensive.

Many backup software utilities do provide support for mirror backups.

Advantages
The backup is clean and does not contain old and obsolete files
Disadvantages
There is a chance that files in the source deleted accidentally, by sabotage or through a virus may also be deleted from the backup mirror. Source: CoolInterview.com

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