http://h7isucmawckzflxhipflydxvxpaytk5fozfk5immffg66rhboc74yxyd.onion/doku.php?id=cloud&do=edit
What are the fallbacks if they fail to meet their servie level promises? Do you have any meaningful recourse?
==== Check their backup procedures ====
Check how often they backup their systems, and how quickly they can restore them if they have a problem.
While having your own backups is essential, if you have to reload your data onto the service, you are limited by the speed of your Internet connection's upload.