A method of operating a data management system includes establishing a base state for a data storage volume, generating a list of blocks associated with the data storage volume that have changed, and creating a snapshot from the list of blocks. A request is received for a step certificate that authenticates an involvement of the requester entity about an object. The fixed transceiver system includes a first antenna intended to be positioned outside the area of non-visibility of the satellite, and at least one second antenna coupled with the first antenna and intended to be positioned in the area of non-visibility of the satellite. The device includes a rotatable sweeper arm connected to the frame and positioned generally orthogonal relative to the feeder conduit axis.