I just had a very interesting tour of the ClearData secure data center. It was amazing. The physical security alone was impressive, guards, concrete barriers, multiple key card entries even a retina scanner. On top of that there are redundant systems for power, water , cooling and data transfer. An operations center monitors everything from the weather to traffic volume to anticipate problems and fix them, often before they happen.
On the technical side there are elaborate firewalls on top of firewalls, anti hacker and anti malware systems that are monitored and updated constantly.
There is no way a typical dentist can provide a level of security even close to this. Yet we are afraid to store our data off site because …well because.