Define what must move
Inventory source data, outputs, metadata, configuration, identities, logs, keys and infrastructure code. Record format, volume, rate of change, retention and owner for each object. Identify data that cannot be exported because of technical or legal constraints.
Assess portability at business-service level rather than per storage bucket. A file copy is insufficient when permissions, relationships, queues and startup procedures are missing.
Agree terms before migration
Contracts should define export formats and APIs, assistance periods, transition security, deletion of residual copies and completion evidence. Commercial provisions need a technical schedule with owners and acceptance criteria.
Name a target in advance: another provider, a private environment or a hybrid arrangement. An abstract exit to somewhere cannot be rehearsed.
Expose dependencies
Catalogue managed databases, queues, functions, IAM, monitoring and networking. Choose a strategy for each: compatible interface, adaptation layer, restoration from an open format or a consciously accepted dependency.
Eliminating all lock-in is rarely efficient. The goal is to know exit time and cost and to prevent critical dependencies from growing unnoticed.
Prove readiness
Export data regularly, verify checksums and restore a limited but end-to-end service instance in the target environment. Measure export, transformation, startup, DNS switch and user validation time.
Leadership needs a concise view: which services are portable, how long and how much exit costs, where critical dependency remains and who accepts it. That dashboard is more useful than a generic multi-cloud declaration.