uh, except that companies have rules about ageing out old data (emails etc.) to prevent
future embarrassment in court excessive on-going storage costs.
Perhaps the answer is for companies to offer goverments an encrypted 'cc' of all traffic, but retain the relevant keys until they see the court order. That way the governments get the bill for working out how to store and retrieve an eye-watering daily deluge of corporate 'HR' messages, dull telecons, bad jokes, links to cat videos, etc.,etc, etc. and then match their 'intelligence' with the right source at the right time to ask, nicely and legally and very specifically, for the right key. Here, Mr Fed, have your monkey back ..and I wonder how long you'll keep it once you know how much it costs to feed and water.