This little video seems quite simple, but has some powerful reminders:
1. Make sure your provider has the same level of security that you would have on site
2. Ensure you understand the service level agreements and what happens if they are not met
3. Be clear as to what services 'must be available' for your users - and make sure they agree to...
4. What happens if you cannot access the Internet? or if the Cloud Provider goes bust!
Also, don't forget the data remains your responsibility where ever it's held so make sure your Cloud provider so check all stored data is encrypted, and do make sure you know where in the world that data is being processed or stored - data protection legislation still applies to your data in the Cloud.