We've mentioned this before, but it bears repeating for new and seasoned genealogists alike:
Do you have some photograph, original document, or other piece of family history ephemera that you have not somehow preserved or shared? What happens if that one copy is destroyed?
The 1870 census will be there to search next week. There may be items in your closet that for one reason or another may not.
Preserve today so that all may use it tomorrow.