Nasuni Filer is a virtual machine front end that uses various cloud storage vendors as a back end, and presents itself to subscribers as a CIFS share, amounting to a network attached store/fat hard drive in the cloud.
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It can be accessed as a shared file repository in any way that administrators want to permit.
As well as being a CIFS share, Nasuni includes an application that can backup file systems, much like Apple’s Time Machine, on an hourly basis, taking snapshots of data that are de-duplicated, then sent to the cloud storage vendor’s repository.