Most-efficient way to copy iPhoto events between computers? I experienced a hard-drive crash recently.  While I was able to recover most of the lost photographs from Mozy, some where lost.  Fortunately, the missing photographs are located on another machine.

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Computer A: MacBook Pro with Mavericks and iPhoto 9.5.1
Computer B: Mac Mini with Snow Leopard and iPhoto 9.2.3


I want to preserve the existing photos, faces, and events on computer B (the recovered items), but copy the photos, faces, and events from computer A (the missing items).

What is the most-efficient way to do this?
The most efficient way to accomplish this would be to merge libraries. Unfortunately, this is not included as a feature within iPhoto, but can be accomplished using an excellent program, iPhoto Library Manager. It's compatible with all versions of iPhoto v8.1.2 or later. 


Your iPhoto Library, by default, is located at: ~/Pictures/iPhoto Library
Either place the iPhoto Library of Computer A on an HFS+ formatted external HDD, or use Target Disk Mode to mount Computer A's HDD as an external drive on computer B. I recommend the former method. 





Choose Source Library: path to A's library on external HDD
Choose Destination Library: path to B's library.
See (3) and (4) for Duplicate Handling and Additional Options, then merge the libraries.