Media storage

I need some practical advice as a newbee amateur (retired and do not do this for compensation) to FCPX. I shot a video of my granchild's music recital at the request of the owner in HD. The original one hour production was slightly over 50 gigs when edited. I exported it in two parts in H264 and put it on YouTube. I really do not want to store the original on my hard drives and want to give everything to the owner. What should I give her? The original clips were transitioned with cross fades, so she will lose a bit of each performance if she gets the final edited version and ever wants to put a particular part in a separate form. She does not have FCPX so I cannot transfer the Project and Events to her via computers. I really don't even know how to transfer the uncompressed original edited version to her. It would obviously be nice if I could give her a disk with a compressed version that could later be blown up to a full uncompressed version but this seems impossible once the movie is compressed. It seems that the original uncompressed version sitting on my hard drive is useless and cannot really be transferred anywhere except hard drive to hard drive. It also seems that the only viable transfer is a compressed version of the final product that can fit on a flash drive, cross-fades included. I wondered how others have faced these problems.

My second question is what is the generally acceptable compression method for putting the video on iWeb. I have my own website and still use iWeb even though Apple has abandoned it. I see no suggestions in the "share" menu for the appropriate compression, so it can quickly download if someone accesses the sight via their smartphones. Presently it plays and stops and plays and stops when accessed by my iPhone.