Writing to this object triggers the switch to copy its running configuration database into a buffer and persist it to either the primary or secondary NVRAM store, chosen by which value is written, and the save runs asynchronously so SNMP polling isn't blocked. Because it is write-only, an admin can never read back which target was last requested here and must instead poll atiSaveStatus to learn when the background save has finished. For example, before a firmware upgrade an admin sets this to saveToSecondary(2) to bank a working config, then confirms completion by watching atiSaveStatus flip to saveNotInProgress(2).