We have just completed moving our websites to a secure location with automatic backups.  We were one of the first companies to use the internet and due to that we were self hosting.  Self hosting was great while it lasted but over time it is a bit riskier having the servers to deal both from a security standpoint and maintaining the servers.

I sleep a little better knowing the sites are off my site as well as our accounting software which is internet based.

When you are selecting a property manager, find out where their data is located.  If it is located in their home or office, it is subject to theft, storm, fire, etc.  A disaster for your property manager could be a disaster for you!