How do I estimate egress costs before a multi-cloud migration?

Baseline current inter-service and internet-egress traffic volumes from existing network flow logs, then apply each target provider’s published egress pricing tiers — egress is consistently the most underestimated line item in multi-cloud cost models.

Common surprise

Cross-region replication traffic for databases and object storage is often left out of initial estimates entirely, and can dominate the egress bill for data-intensive workloads.