I now have iPhoto and Photos on my Mac.
1. Do I need both? If not, should I delete one? Which one?
2. How can I be sure that they both contain all photos?
iPhoto Library: 150.95 GB
Photos Library: 152.73 GB
MacBook Pro (13-inch Mid 2012), iOS 8.4
1 - maybe - getting rid of either will not save much space so the best plan is to keep both for a few months until you are sure that you are happy with Photos ( you might need or want the iPhoto library in the future)
2 - obviously iPhoto contains all photos since that is what you have as a starting point - so then check Photos to see that tit has the same number of photos in it
3 - while the libraries look large they share hard links to the original photos and the previous do not use much more space in total than either one does - Photos saves disk space by sharing images with your iPhoto or Aperture libraries - Apple Support
LN
iPhoto or Photos? HELP!
