It's amazing when a company sets a VERY low limit on a backup solution. If I was in your situation with such a low ball figure the first thing I'd do is ask the people in charge how much their data is worth if it was all lost. Once they put a dollar amount on that then you can sit down and come up with a viable solution to protect the "valuable" data. Putting a low ball figure like 1500 euros on 500gb of data is just ridiculous.

But yeah, I'd say there is going to be no viable solution for that low of a price.