Which Of The Following Are Backed Up During An Incremental Backup?
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Which of the following are backed up during an incremental backup?
In the incremental backup, its backups only the files that are changed from last. Now, let us learn about different types of backups in detail. We can define fault tolerance as the prevention of data loss if the component fails.
But in some of the events if the fault tolerance fails, then the only option available is disaster recovery. Disaster recovery is nothing but, it is a process for the rebuilding of the organization of the data after the disaster being occurred, this type of process we call data loss. So we need to back up the data even we measure the fault tolerance.
Normally, we have three different types of backups. They are Incremental backup, differential backup, and full backup. Now, let us take an old tape backup storage device, many of the organizations are still using the backup storage device. The different backups that we learn can apply to all storage devices.
The full backup can backup all the data. All the data can simply get back up into a single tape. The full backup is the simplest type of backup to perform because it uses only one tape. But if the organization has a large amount of data, then performing if the full backup daily would be not efficient. The main disadvantage of doing a full backup is that it takes the longest to perform. The full backup does not have an advantage during the data restoration.
The Incremental backup is much faster than the full backup. In the incremental backup, the only data that is backed up is that has been changes since the last or incremental backup. To understand the concept in detail, let us take an example.
When a company does the full backup on Monday and performs incremental backups on Tuesday to Friday. The only data that is backed up is that data that has been changed since the last full or the incremental backup. So here, Tuesday will only backup’s the Tuesday’s data and Wednesday will only backups the Wednesday’s data, and so on.
Each backup tape only backups the data that has been changed on that week’s day. The main advantage of the incremental backup is that it is the fastest backup compared to a full or differential backup. And the main disadvantage of the incremental backup is that it takes the longest when we have to restore the data.
We have to restore the full backup along with the incremental backups and we have to restore the incremental in the same order. Here first we have to restore the full backup and we have to restore the incremental fro Tuesday to Friday in the correct order. After this is performed we have to full data restore for that week. Sp the incremental restore takes the longest time.
The differential backup is faster than the full backup but is slower than the incremental backup. It backups the data that has been changed since the last full backup.