saldo di bilancio - budget balance
bilancio (di una azienda) - balance sheet, slang is "the books" Examples: we must finish the balance sheet by Monday. We must close the books by Monday.
fondo archivistico - I am not sure. It looks like archives fund, but I have not heard that term used. Could you give me a sentence?
contabilità (sempre di un'azienda) - accounting.