Vercel Sandbox is now globally available

Vercel Sandbox's global availability introduces region selection for sandbox deployments, addressing latency issues for teams with geographically distributed backend services. The initial rollout covers four regions, with plans to expand to all Vercel regions. This change allows engineers to colocate sandboxes with databases or object storage, reducing round-trip times for API calls or data access during testing or staging workflows.

The failover mechanism is limited to Pro and Enterprise plans, creating a tiered resilience model. When a primary region becomes unavailable, new sandboxes automatically start in the nearest configured failover region. However, snapshots remain tied to their original region, which means teams must either accept this limitation or manually manage snapshot replication across regions. The automatic handling of snapshot loading during failover mitigates but doesn't eliminate this constraint.

Adopting the new multi-region capabilities requires updates to both the SDK and CLI, along with configuration changes. Teams must explicitly set default regions and failover regions either through project settings or CLI commands. The SDK allows runtime overrides of these defaults, providing flexibility for specific use cases. This adds operational overhead for teams that previously relied on the single-region default, though the tradeoff is improved performance and availability.

The region-locked nature of snapshots creates a potential bottleneck for teams that rely heavily on pre-configured environments. While failover regions provide continuity for new sandbox creation, existing snapshots cannot be moved or accessed from different regions. This limitation may require teams to rethink their snapshot strategy, particularly for workflows that involve frequent environment resets or sharing of pre-configured states across global teams.