Questions to Ask If You're Considering Using SaaS

Here's an addendum to my earlier post, Cloud Computing - Technology Savior or Privacy Nightmare?

These are some questions you would want to ask a potential SaaS vendor, from an article by Alan Cohen, "Cloud Computing, Is It Safe?":

1. Where is my data -- and how secure is it?
2. What happens when disaster strikes?
3. Do you provide a service level agreement?
4. Who owns the data -- and how do I get it back?
5. How much customization can I get?