fileCopyUnitId — Multiple manufacturers; see the original MIB MIB copies (LibreNMS/Observium Community), Edgecore official enterprise switch MIBs, Edgecore MIB copies (Observium Community)
Specifies the switch unit for stackable devices. When performing the 'copy unit file' or 'copy file unit' action, if neither fileCopySrcOperType nor fileCopyDestOperType is unit(5), this variable can be ignored.