____________________ is the copy of data on a computer or hard drive that is saved to an external media such as a DVD, CD, or flash drive. In an organization, it is routinely done—may it be daily, weekly, or on a monthly basis. This is to ensure that the organization’s data are protected and are readily available. Select one: a. Preventive Maintenance b. Defragmentation c. Emptying the recycle bin d. Backup