Talkiet: I just phoned them as well to see if they would be a feasible option for me if I needed to change. The guy I spoke to sounded knowledgable and was very helpful and honest about their offering.

Unfortunately it turns out their fair use policy would preclude me using the service as their unlimited offering isn't actually unlimited...

http://www.ibus.co.nz/iBUS_Unlimited/Fair_Use_Policy.html

They did point out they have commercial offerings suitable for my level of storage, and in fact highlighted a really nice feature to seed the initial backup with a couriered hard drive (great idea!) but just beware that unlimited is significantly less than unlimited in this case.

(No judgement of the quality of their service here - and in fact I thoroughly appreciate they are being careful to maintain a sustainable business model)

Cheers - N