I don't know that "preserve" is the correct term here. It's certainly an interesting way to collate family history, but this encyclopedia will last only as long as the OP is interested in and able to maintain it. Once OP gets bored, or falls ill, or dies, unless there's someone else interested in it, the history is gone, reverted back to oral memory.

If instead, the OP had collected this information into a physical book, when they get bored or sick or dies, the book gets pushed into a closet or garage, waiting for some grandchild, nephew or niece to pull it out and rediscover the family history. And if anyone has even a slight interest in continuing the legacy, they don't have to know how to use a computer, just some basic scrapbooking skills, which we all learned in kindergarten.