I've collected everything over the years, from RAW files to digitized slides and family albums, in Lightroom and I use LR to develop, organize and create collections. All is backed up in several places. I'm now in the process of exporting collections from LR to my Google Drive as jpgs of about 2-3MB each. Then I share the link to this library with friends and family and encourage them to download parts or all of it. The small size of the jgps makes this quite doable with thousands of photos. People can also easily view them on mobiles or whatever. This is my strategy, for now, for trying to let the library live for a long time. Hopefully long after I'm gone.