This particular concept is called CMS Vault. It addresses hosting disasters that I personally faced with clients' sites over the past few years, including failed upgrades, hackings, site-jackings, and buggy plugins.
What I'm looking for from the HN community is the following:
- intuitiveness of the overall concept.
- validation of stated problem.
- viability of the solution.
- tips for execution.
- market segmentation.
- cautionary tales.
The canvas can be viewed here:
http://www.scribd.com/doc/75834784/CMS-Vault
I will appreciate any and all feedback from the HN community.