A device for integrating file systems includes a plurality of storage device interfaces. Each storage device interface is operatively coupleable to a corresponding storage device, and each storage device has a corresponding storage device file system. The device also includes a host interface and a hub configured for operatively connecting between the storage device interfaces and the host interface. The hub is operative to create a virtual file system that aggregates the storage device file systems. The virtual file system is configured to represent to a host, via the host interface, each file of a first group and to refrain from representing to the host each file of a second group, where the files are stored in one or more of the plurality of storage devices. Each file of the first group satisfies a first condition and each file of the second group fails to satisfy the first condition.