Respuesta :
Well we do, because... Say you did something against the law, but it got proven wrong that you didn't do it. You have the right for that record to be wiped clean so it says you are not guilty.
Yes, we do have an obligation to the future generations to preserve the online records of people, because the history is important to know. To balance privacy and the online records, are only posting important things that can pertain to lots of people, and also keep a journal for the more private records.