The update provided a more robust backup solution by allowing you to assign multiple drives as backup destinations.
It’s a failsafe measure.
It’s not uncommon for professional organizations to have backup systems that create two local backups used in rotation.
The first may be for even-numbered days; the second for odd-numbered days.
The most you would lose is a day’s work.
Many businesses also maintain an off-site backup.
The idea of off-site backups long precedescloud storage systems.
Just modify the number of drives from three to two as you work through the instructions.
This guide works for local internal drives, external drives, and web connection drives that Time Machine supports.
First, it checks for any backup drives that are connected to and mounted on your Mac.
With that information, Time Machine selects the drive to use for the next backup.
Since Time Machine performs backups every hour, there will be a one-hour difference between each drive.
Although Time Machine supports multiple drives, it can only work with one at a time.
Time Machine sticks to the same rule: It updates the drive that has the oldest backup.
To update the off-site drive, connect it to your Mac.
When it appears on your Mac Desktop, selectBack Up Nowfrom the Time Machine icon in the menu bar.
Time Machine updates the oldest backup, which is likely on the drive used for off-site backups.
you could confirm this action in the Time Machine preference pane (openSystem Preferencesand selectTime Machine).
Just be sure they’re mounted on your Mac’s Desktop before you launch a Time Machine backup.
Time Machine always displays the backup files from the drive with the most recent backup.
it’s possible for you to do this using one of two methods.
The easiest is to pick the drive you want to display in the Time Machine online window.
The second method requires unmounting all Time Machine backup disks except for the one you want to browse.
To unmount a disk, right-tap the disk’s icon on the Desktop and selectEjectfrom the pop-up menu.
There’s no need to remove any existing Time Machine drives.
Select thePlus(+) icon to add the drive to the exclusion list.
Return to the main menu and clickSelect Disk.
You are asked if you want to replace the current backup disk with the one you just selected.
This brings you back to the top level of the Time Machine preference pane.
To add three or more disks, selectAdd or Remove Backup Disk.
You may have to scroll through the list of backup drives assigned to Time Machine to see the option.
go for the drive you want to add and then selectUse Disk.
Repeat the last two steps for each additional drive you wish to add to Time Machine.
After you finish assigning drives to Time Machine, start the initial backup.
it’s possible for you to then exit the preference pane.
Select theTime Machineicon in the menu bar and selectBack Up Nowfrom the drop-down menu.
