Geo-redundancy means running systems and storing data in more than one geographic region, so a data-centre outage, regional failure or disaster in one place does not take the service down or lose the data. It is the infrastructure behind uptime commitments that survive bad days rather than assuming there will not be any.
For workplace platforms the stakes are concrete: reception cannot sign in visitors, and nobody can find a desk, while the system is down. Procurement questions worth asking any vendor: which regions, how fresh are the replicas, how often is failover tested, and is the uptime commitment written into the contract.