The invention provides a file server that provides for backup and restore of files in a heterogeneous file server environment. The trip device causes the handle member to rotate upon the occurrence of a predefined condition, such as an overcurrent, thereby causing the operating arm to rotate and wherein none of the components except the frame assembly is attached to the housing. The field bias optical element is implemented with a prism and grating such as a grism. If one of the sets of header fields matches the distilled input header, its corresponding proxy destination or source ID is substituted into the corresponding FC-2 input frame headers destination ID field, whereby write command data transfers are accomplished between host computer and a particular disk drive directly, avoiding the aggregator and latency otherwise introduced by the aggregator. The solar power supply arrangement includes a solar collecting device supported by the main supporting stem, wherein the solar collecting device has a collecting surface arranged to expose to sunlight for extensively collecting solar energy.