The concept of having multiple backups isn't new; it's been around for ages. In business, it's not uncommon to have backup systems that create two local backups that are used in rotation. The first may be for even-numbered days; the second for odd-numbered days. The idea is simple; if one backup goes bad for any reason, the second backup is only a day older. The most you would lose is a day's work. Many businesses also maintain an off-site backup; in case of fire, flood or other disasters, the business won't lose all of its data if there's a copy safe in another location. These are actual, physical backups; the idea of off-site backups long preceded.

• A Mac running OS X Mountain Lion or later. • Three drives. Firefox for intel mac. Each drive must be large enough to store the data you have on your Mac, and then some. The more space available on the backup drives, the more historical Time Machine data they can hold. • If you only want to create a two-drive backup system, you can still use this guide. Just modify the number of drives from three to two as you work through the instructions. • Types of drives: That's up to you.

This guide will work for local internal drives, external drives, Time Capsule drives, and network drives that are supported by Time Machine. • About an hour of your active time to set up the Time Machine backup system, and a good deal more time to perform the first set of backups.

Jul 12, 2015  A few minutes for initial Time Machine setup; Ample time for Time Machine to run it’s first backup of the entire Mac; You’ll want to be sure the external hard drive in use for Time Machine backups is at least the same size as the internal hard drive on the Mac, but preferably much larger. To add new folders, click “To Amazon Cloud Drive” from the left backup tree. On the right, your Amazon Cloud Drive backup information will appear and you can click the “Add a Folder to Backups” option. From the dialogue that appears you can then select the folder you want to backup and click “Open”.