500 years is too long for modern tech. You will definitely need many copies of different types of storage, down to atomic-level records such as DNA. GitHub's Arctic Code or Amazon vault looks like the first Godzilla computers, but you're asking for a "500-years PC".

Perhaps there will be a technology that allows you to write site files in the DNA directly of your children and run a micro-DNA web server in the body, and your grandchildren can surf on your Internet data in the brain.