I'm not 100% sure as I do not run a xp24000. But, Remote Copy is a feature a lot of SANs support and since they are both HP products. I'm sure there is some way of replication available between the two.

Hi Steven, We are mostly using Local Internal Access and if External, VPN access provided by our firewalls is used for specified users. All of our sites are linked so external access is not always necessary but, I think using Citrix if setup securely would be a good option.