It is good to familiarize yourself with the different backup types available if you are trying to compare systems to decide which is right for your needs. The backup types to compare include differential, incremental and also the traditional full backup. Each of these backup types are explained below including information about different backup combinations that work well.
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A full backup is always required as a first step in any backup system. A full backup means that every data file in your system is backed up onto a disk or server. The drawback of full backups is the time is takes to complete them however, there is no way around this.
A backup system that backs up only the data that has changed in the time that has passed since the previous backup was done is called a differential backup. To illustrate how this works, imagine that your data was fully backed up on Thursday, when the following day’s scheduled backup starts on Friday, it will only backup new data that was created between the time the Thursday’s backup was completed and Friday’s backup started. The benefit of this kind of backup system is that when you do a complete restore of your data only the last differential backup needs to be restored which saves a lot of time.
Incremental backup technology is a different type of backup system which involves making numerous backup of a given data set. Contrary to a differential backup, an incremental backup does not only save the last one. Each original set of data that is backed up gets stored once. All successive backups save the data files that were changed or added to the data set between backups only.
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When using an incremental or differential backup system it is recommended to select only one of the following backup combinations. The first choice isn’t a combination but rather the old fashioned backing up of all your data each time regardles of what has changed or not. The second choice is to fully backup your data combined with incrementally backing it up. What is meant by this is to perform full backups from time to time and to perform regular incremental backups. Lastly, you can choose to perform periodic full backups combined with regular differential backups. The differential backup system will save all data that changed in the time between the last full back and your current differential backup.
As has been outlined, the three main backup types are full backups, differential backups and incremental backups. A full backup is time consuming but a mandatory part of any type of data backup plan. The system that just backs up the changes made since the previous backup is called a differential backup. Lastly, an incremental backup saves multiple backups and not only the last one. It is quite possible to benefit from the best aspects of each backup system by selecting a combination of the different systems as was explained earlier in this aritcle.
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