The following forms of backup exist: full, complete or normal: copy of all the data specified for a device of safe storage; Advantage: it is the type of backup that it has the faster complete restoration and descomplicada, therefore all its archives always they are contained in last backup carried through and can be restored of one alone time; Disadvantage: it is the type of backup that more delay to be made and what more occupies space, therefore, to each time that backup will be fact, they will be enclosed all the archives contained in the origins of the work; incremental: copy of the data you add backup previous, that is, addition of the information not contained in last backup. Advantages: the use of backup incremental allows to optimize the performance of the process of copy of security as well as diminishing the busy space to store the copies. Moreover, backup incremental it allows to keep some versions of one same archive; Disadvantage: to restore its archives completely, it is not enough to restore backup complete, it must be restored backup complete more recent, and, later, all first the incremental ones in the order where they had been generated later to the complete one. differential: copy of the data you add backup complete immediately previous, that is, addition of the information not contained in last backup complete. Advantage: the use of backup distinguishing allows to optimize the performance of the process, therefore the archives modified after are only copied last backup complete; Disadvantage: to restore its archives completely, it is not enough to restore backup complete, the most recent one must be restored first complete, and, later, backup distinguishing. A good planning for copy of security and restoration of the information is essential for a company of any size, however, unhappyly, this nor always is the main objective of the organizations that, many times, not they invest in the necessary budget for the system of backup..