Editing between two people halfway across country

My friend wants me to edit her how-to videos that she would shoot but has no idea how to edit. I'm trying to look into Cloud technology but really don't know where to start and whether they would work for video files. She wants 5 minute videos so there would not be that much footage.

I just want to figure out how to do this so we don't have to keep mailing hard-drives between California and Indiana. Any suggestions?

Thanks!