A system in at least one exemplary embodiment includes a source data unit and at least one backup data unit for backing up data from at least the source data unit offline. The first module constitutes a first system. The program instructions and the data are stored in a memory accessible by the system. If the remote device recognizes the first key code number from among the stored plurality of key code numbers, the remote device generates a second key, which includes a second random number that specifies a second key code number, and a portion of the identification information. The storage medium stores the processed file of the NRT service data. The at least one read threshold may be iteratively perturbed for each sequential read operation that the read performance is evaluated to be sub-optimal.