Various techniques designed to provide a periodic write out of a complete program and its data ( i . e . , the contents of the working storage area ) to a backup storage or memory unit 各種轉(zhuǎn)儲技術(shù),用來把整個程序及其數(shù)據(jù)(即內(nèi)存工作區(qū)中的內(nèi)容)定期地寫到作備份用的存儲器或內(nèi)存設(shè)備上。