A good answer is a good start.

Operating-system maintenance and application development are different. State supported services and application boundaries in the offer.

Use scoped accounts and appropriate secure access methods. Do not put passwords in public requests or email messages.

Snapshots often share dependencies with their source platform. Assess an independent backup with separate failure domains and recovery policy.

Define acceptable data-loss time, then choose frequency around change rate, retention cost and restore needs.

Downtime needs depend on application writes and architecture. Plan the maintenance window and final data synchronization in advance.

Retain a controlled rollback option until data, DNS and application validation succeed in the new environment.

Licensing and development or integration are separate items. Check required licenses and versions in the proposal.

Back up first and test orders, invoices and provisioning in a compatible staging environment. Apply live changes with a rollback plan.

Describe the problem, users and example workflows to begin. Design and technical scope can be defined together.

Specify source code, documentation, usage rights and ongoing maintenance as separate terms in the agreement.

A firewall limits access. Application vulnerabilities still require updates, secure configuration and appropriate application controls.

Apply rules in a controlled way with alternate administration access and a rollback plan. Test new policy before rollout.