Datacenters are graded by specific tiers, Tilaa only works with data centers that are qualified as TIER 3+, the highest grade possible in the Netherlands.
What does that mean?
This means that we use separate UPS and generator lines per power feed, double power supply systems for each rack and N+1 cooling and ventilation. The data center facilities are monitored 24 hours a day.
More information about data center tiers: http://en.wikipedia.org/wiki/Data_center#Data_center_tiers