Where can I outsource business class file server hosting for my small business?

Question by Steve: Where can I outsource business class file server hosting for my small business?
I outsource hosting for my Exchange server, SharePoint server, Web site server and soon hosted VoIP services. Now, I'd like to know if I can outsource my company's file server to a hosted server. This would be for multiple users to access and synchronize files securely with collaboration, backup services, disaster recovery as well as location redundancy. Can you recommend a provider to me?

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