After looking at all your previous posts cathy it seems that you are working to a very strict budget.
My concern is that you may be underspending, this will only leave you with a defective system that does not meet your requirements.
If i were you i would really push for more money, you have aleady comprimised the benifits of a domain to save money, this alone causes back-up complications, as stated above you get what you pay for.
Dont be affraid of spend lump sums, look at it over a 3 year cost of ownership plan, if you spend little money now on your system the likely hood is that you will end up spending more in a short period of time, upgrading the system to keep up with your requirements.
Plus defectve systems cost lots of man hours in support and administration. Upgrades costs lost of man hours in implementation and testing.
Best stratagy in my opinion is to future proof you system, spend money early on to purchase a solution that will last you 3 years with a minimal amount of maintanence and support.