This morning I was updating part of my contacts and accidentally deleted a contact I needed. Since I have iCloud active, it immediately deleted it on all Apple devices.
Panic set in until I remembered that Time Machine continually backs up my system.
I went to the iMac that has Time Machine activated and looked for the previous entry. I restored that contact and my heart rate went back to normal.
Once again, Time Machine has saved my butt.
When I was on Windows 7, I used Altaro Oops!Backup. It did the equivalent, but cost $37. I see that Windows 8 has a builtin Time Machine Feature. That by itself would make me upgrade from Vista or Windows 7 to Windows 8, if I were still on a Microsoft environment.