- Since different cloud providers have different security measures and different plans, questions 1 to 3 can't be answered in general.
- Since you didn't tell about your current Information Structure system, nobody can tell the answer to question 4, except you.
- For question 5: cloud and hosting isn't the same. So you can't easily replace the one with the other. For example, gmail (a cloud based mail service) doesn't do you website.
How secure is Cloud Computing?
How costly is it to shift to Cloud?
Is there any recurring cost or overhead expenses attached to it?
How much is it going to affect our current Information System structure?
What is the ROI on replacing traditional hosting scenario?