>- How quickly do you need to save files to the cloud, or retrieve them? Typical business LANs these days are gigabit i.e. 1,000 Mbit/sec. Typical asymmetric business broadband might be 20 Mbit/sec download, 5 Mbit/sec (or less) upload. In that example file transfer speed from cloud to business would be less than 2% of LAN, and upload speed from business to cloud less than 1%.
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>- You may need or want to do the initial data transfer to the cloud via USB hard drive or tape. Uploading 150GB to the cloud over typical broadband upload speeds can take weeks or months

Having USB3 or ESDI disc access makes sense. But the upload estimate seems to be too bad IMO: upload transfer should be ~500kByte/sec. 2 weekends if there is no traffic on weekends, a week if upload is not taxed heavily by normal biz. As docx usually compresses quite a bit, an automated setup where each dir is compressed before transfer and decompressed cloud side should speed the transfer up by a factor of 2 or 3.