What makes a synthetic backup different from an incremental backup is that the backup server actually produces full backups. But synthetic backups take things one step further.
Like any other incremental backup, the backup scheme involves taking a full backup, followed by a series of incremental backups. What are the differences among full, incremental and differential backups?Ī synthetic full backup is a variation of an incremental backup. differential backup is that, as time progresses, differential backup media can grow to contain much more data than an incremental backup. Of course, the tradeoff in incremental vs. Incremental backups, on the other hand, could require a great number of backup sets. Restoring a differential backup never requires more than two backup sets. When speed is important, such as in a disaster recovery scenario where downtime is unacceptable, rapid restores can be crucial. The advantage that differential backup offers over incremental backups is a shorter restore time. On Wednesday, however, the differential backup would back up any data that had changed since Monday as well. It would, therefore, be identical to an incremental backup at that point. Tuesday's backup would contain all of the data that has changed since Monday. Suppose that you wanted to create a full backup on Monday and differential backups for the rest of the week. differential backup is that, while an incremental backup only includes the data that has changed since the previous backup, a differential backup contains all of the data that has changed since the last full backup. Differential backupsĪ differential backup is similar to an incremental backup in that it starts with a full backup and subsequent backups only contain data that has changed. In addition, if any of the backup media happens to be missing or damaged, then you will experience incomplete data recovery. After that, you would have to restore Tuesday's backup, followed by Wednesday's. To do so, you would have to first restore Monday's full backup.
Going back to my previous example, suppose that you wanted to restore the backup from Wednesday. The primary disadvantage of incremental backups is that they can be time-consuming to restore.
Wednesday's backup files would only contain the data that has changed since Tuesday and so on. Tuesday's scheduled backup would only contain the data that has changed since Monday. Incremental backups only back up the data that has changed since the previous backup.įor example, suppose that you created a full backup on Monday and used incremental backups for the rest of the week. Incremental backups were introduced as a way to increase backup speed and decrease the storage space that it takes to do a full backup. Because not every organization has the time or storage space for frequent full backups, other types are often necessary.
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