Depends on where you are, how your local group trains

Here in NYC, at least in Queens, we'll show up with High Power WiFi (serious gain and power - like watts), VHF Data via packet, and maybe (depending on who) HF data - IF the local VHF data nodes are up, we have a link to a bi-directional HF node that's on generators here in Queens.

We regularly drill on getting email data across the state without using the internet - but we also have like 3-4 points to bridge into the internet local

We show with a pop3/smtp that will hook right into your network, and a set of outlook/outlook express scripts to add that account to your local PCs - we setup the "post office" - we can hook it to your lan/broadband - if it sees the internet is up, it sends via that, then tries modem, then wifi, then vhf packet, then HF, then will try and fax - auto fallback

So the tech is there - just depends on how far your local guys are willing to go, and what they have trained for