If you mark and save places in google earth be sure and right click the folder you save them in, and save them as a .kml file to your pc. Today I was going to check a waypoint I had marked in google earth and discovered that all of my favorites were gone. I assume that a software upgrade had been done that caused everything to default. Fortunately I had saved what had been marked and was able to restore without going through the process of finding the waypoints again.
Hope this saves someone some heart burn.
For XTRA safe safekeeping email the .kml file to me and I will store it for you.:Rofl

