How much memory do I need for backup?

Checking your Mac’s hard drive capacity

Right-click (or control-click) on Macintosh HD. If you don’t see the hard drive on the desktop, click Finder in the menu bar at the top of the screen. Choose Preferences, then, under “Show these items on the desktop”, check Hard Disks.HD1

 

Choose Get Info.  HD2

 

 

 

 

 

 

 

 

 

HD3