The differences between preserving, curating, and aggregating data is that preserving data is simply maintaining its existence, curating is making sure the data is well kept and looked after and aggregating is bringing all of this data together for purposes such as an archive. The major challenge each of these practices have is simply maintaining enough space and resources to keep these things together, whether it be funding or actual space.
The major tension present in digital archiving is property rights, almost everything is owned by someone else and you need to have the rights to use those things whether it be pictures, sounds, etc. That of course goes against the very idea of keeping information free for everyone and it can be very expensive. These tensions are being addressed by the fact that a lot of museums and things of that nature are lowering the barriers of entry for people to digitally archive their information as compared to ten or twenty years ago
In order to preserve my own family history I would go to all of the older people in my family, which unfortunately there aren’t too many of, and try to assemble as much raw information as I possibly can. I would probably not keep anything private if it’s for the sake of preserving my own family information. I’d probably implement some sort of search function into the database but apart from that I would keep it pretty simplistic with basic categories and things like that. I would keep the collection closed, mostly because I don’t think my family really has anything important historically to contribute. I’d determine what objects belong in the collection by personally determining any historical value to what I have.
As an archivist, I would likely just preserve materials that have real relevance to the betterment of humanity. A good way to keep things relevant is to go into a project or archive with a very specific purpose and stick everything you put in to that purpose.