In its most basic form, a hybrid backup starts with the primary user application that requires something to be backed up. Depending on how important the data is and the likelihood that it will be needed again soon.
In Hybrid Backup usually a 3-2-1 rule is followed for data backup. The 3-2-1 backup strategy is made up of three rules:
- Three data copies. Three copies of all critical data should be made on a regular basis — daily or more frequently — including the original data and at least two backups.
- Two types of storage. Two different storage types should be used to store the data. Both copies of the backed-up data should be kept on two separate storage types to minimize the chance of failure. Storage device types could include an internal hard drive, external hard drive, removable storage drive, a tape library, a secondary storage array or a cloud backup environment.
- One off-site location. One copy of the data should be shipped to an off-site storage facility. At least one data copy should be stored in an off-site or remote location to ensure that natural or geographical disasters cannot affect all data copies. This copy can be physically delivered to the off-site location, as with tape-based backups, or it can be replicated to the secondary site via telecommunications facilities.