Hi all,

I'm currently mapping out a project for a corporate client with their headquarters here and three manufacturing/logistics hubs across different countries in Europe and Asia.

They want a unified system where a manager can issue an access credential (RFID or mobile token) at HQ, and have it immediately active across all sites. My concern is the global database synchronization lag and how local controllers handle offline authentication drift if the WAN link drops mid-sync.

For those who have deployed large-scale, cross-border access control:

1. Do you rely on a heavy local edge database at each site that syncs periodically, or are you pushing for full cloud-managed controllers that talk directly to a centralized server?

2. How do you pitch the balance between "Instant Sync" and "Local Survivability" to an IT department that is paranoid about bandwidth consumption and data compliance (like GDPR)?

Would love to know what kind of network architecture or hardware logic you've seen hold up best for cross-continental deployments.

Haven't done international but just use a site to site VPN and a central server.the door controllers will use local data if the link is temp lost