The reserve computer will itself be protected by all of the various measures afforded to a machine that requires longevity, to the extent it's more like a server.
E.g. RAID array to protect from single-drive failure, the drives themselves will be encrypted, the computer stored in a location with a back-up generator, in a specialised room tailored to withstand fire, floods etc.
The service is there for those who wish to store away their BitCoins with peace of mind, the service is not expensive if you consider annual banking fees in the system. Indeed, it is specifically biased towards larger deposits to discourage people from treating it like a bank.
The whole point of the idea hinges on the idea that governments will start cracking down on BitCoins, and the community needs far-flung locations at which to bury wealth.
The other point of the service is to act as a centrifuge for larger stakeholders to pool their funds into co-operative projects, I simply provide the middle-man service.
I respect that a lot of the community, by the very nature of BitCoins, are suspicious but I am as sick of society as you all are and simply wish to offer my help in the co-ordination and organisation of exciting projects which are only feasible on a macro-level with co-operation and commitment from all parties.