I looked back at my call log and found where he actually left a message that said he is with Digitiliti Disaster Recovery which operates out of the old Federal Reserve building in Minneapolis. He identified himself as "Danny" that time.
http://www.digitiliti.com/ is their URL
So, they seem legitimate, but this guy doesn't know how to leave a voice mail.
We are not a "telemarketer". We do use the telephone in explaining our sophisticated suite of Disaster Recovery / Back up / Storage products to customers. We are a business-to-business technology firm serving predominently the small- and medium-size enterprise market. We are not currently engaged in the "consumer" or small office / home office market, although we are always evolving and willing to provide services where it makes sense. Our digital vault is, in fact, in our hardened, secure data center space downtown Minneapolis, along with our other colocations. If you have a need for our services, we are the premier service vendor in this space and would be pleased to have the opportunity to speak with you!