Hi,
I think this case sums up the rps service.
At the bottom end you have shared hosting - clearly slow for anything other than static sites, as you are in a massive cluster with millions of other sites (ovh claim to host 7.6m sites!) and fairly average powered servers.
If you want to grow your business you can go for the upgraded shared hosting offers but you are not going to see much improvement for database intensive sites as you are effectively using the same clusters.
The big benefit is that the system is fairly stable and because a lot will be affected they fix problems quickly.
If you want more performance you can go for rps but reliability becomes an issue and you are in a catch-22 situation - You are paying more for performance improvement, but getting a more risky service as they think you are not paying enough to warrant reliability.
Kimsufi seems to be a bit better, but their argument is still that you should pay for a full dedicated server in order to have reliability which is fine if you have deep pockets.
Everyone understands that 99% is the common level for reliability unless you spend a lot of money, but for a managed system like the rps surely you should expect to be up and running in less than 6 days! It is not as if you can do much to fix it yourself.
I think if you are selling on, you should have a backup - but that begs the question how to do it at this price point? Another rps? - could be on the same node. Shared hosting? As far as I can tell you can't IP failover to shared hosting so you would have to copy everything and reset the DNS, but for how long? As you don't know the extent of the problem. VPS with another host (you can't IP failover so the same applies as for shared). Kimsufi or Dedicated? Why bother then with rps in the first place?
I think OVH seem to think that the rps set up is just for customers who want to play on the internet - it is virtually impossible to quantify loss from downtime unless you are a reseller or run an sales site.
Also, let us know why this fault in the RPS caused you a loss of money or such a big problem. we will first tell you that if you want guarantees on your server, and to host a proper 24x7 business application, get a pro server, not an RPS.