Nice to see things moving forward!
As far as the paid versions go, I feel that the 1st tier of the paid version (Basic) should start at 1 year of data retention. Most everyone is on a 1 fiscal year calendar as far as bookkeeping is concerned.
Anything that is recorded within the year needs to be able to be accessed. In my opinion, if I choose to pay for the service, at the bare minimum I should get 1 year of retention for my record keeping.
Also, the initial pricing seems to be on the high side as compared to Autotask and Tigerpaw (both offer unlimited data retention as long as you continue the service on their SaaS platforms).