Coincidentally they (Arizona) have no income tax.

Arizona has personal income tax. I used to to live there and filed every year. States with no income tax are:
Alaska
Florida
Nevada
South Dakota
Texas
Washington
Wyoming
New Hampshire and Tennessee tax only dividend and interest income

>>>MLSs only track currently offered properties, and the records themselves belong to the person making the listing
MLS systems track currently offered properties and history for providing "comps" to current listings. Second class access is available for users like appraisers and title company agents with either off market or archive only access.

>>>records themselves belong to the person making the listing
The listing belongs to the Realtor Broker sponsoring the agent who signs the listing. Depending on the local MLS structure, the Broker is often a share owner of the MLS. The MLS provides the "trading floor" and advertising for agent to agent business. In a little town, a weekly tour bus can show off the latest listings. In a larger metro area, replacing the trading floor can have a major impact on sales.

>>>individual agents would just have to re-submit their listings
And how do you propose to recover the history, as well as the listings of the the guy who retired or landed in jail? It's not what's for sale, but what's for sale and what does the market history deem a reasonable price.

The interest of the database owner is to sell access. It's the business of the MLS to provide data, so anything that impacts access is a very big issue. Even so, some large MLS entities so understand the importance of off site backups and felt RAID will resolve any issues.

We had one customer burn down and were able to move communications, fly out a replacement system and reload the system with transaction files to close of business on fire day within 36 hours. Another customer would ignore changing tapes until they lost three days of updates. They never missed a tape cycle after that.

Home mail delivery could be dropped on Tuesday and Thursday. Maintain Saturday, which allow you to get that Netflix fix for the weekend. Home service to 4 days a week shouldn't present an issue. Business and PO Box delivery can be maintained on a 6 day schedule. This gets rid of the home route delivery twice a week. If you really need that daily mail fix, rent a PO box or a private mailbox at a business.

I used to travel, frequently without much notice and have had a PO box for years. I check it 3 or 4 times a month. I know when bills come in, although that's generally internet based now. Any mail that comes to the house can be assumed to be junk mail, aside from Netflix. Does paper mail have time based significance any more?

People are getting upset that someone recorded wireless transmissions? Come on, it's radio, once you broadcast it's there for the whole world to pick up. Encryption can slow down someone reading your traffic, but that's only a speed bump. There is no expectation of privacy on a radio broadcast, if you think your wi-fi network is secure, you're only showing the world that you don't understand the technology.

Compare this to the Bush/Cheney Regime program to record network and phone traffic. Where's the outrage and investigation of King George? The current king has quietly continued this program. I have more trust in Google than I do the the United States government.

One more time, if you broadcast it, it's available for anyone to intercept.