I would add a few more points. (1) Track record: if the service provider has a track record. You don't want to risk your data by being a beta tester. Choose a company that has been around for some time; (2) Data encryption: more than just secure file transfer, you need to encrypt your files for ultimate security and privacy. (3) Check if the service provider has a viable business model. Being a big company doesn't mean reliability. AOL's XDrive, HP's Upline, and MediaMax, Omnidrive, closed door in the last few years.

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