Egressive mainenance options - what have we got?

Anne and Patrick indicated they'd had some indication of maintenance options from Egressive, but didn't have it avaialbe on Saturday. I'm interested to see the option and prices , as well as knowing

if Egressive have us locked in to using them. They host the site, and presumably we pay them for that. does the hosting contract have an element of maintenance and security built in since the site was also developed by them?

What thigns are we free to take on ourselves?

what things are we free to contract out to other parties? presumably some of this can occur as I understand the integratio with CiviCRM is being done by someone else.