in the Hierarchical Storage Manager,the process of copying data sets which have been opened for reasons other than read only access since the last backup version was created,and meet the backup frequency criteria

• 在分级存储管理程序中，复制若干数据集的处理方法，这些数据集是指从上一个后备版本建立以来，不是由于只读存取而打开过的，并且满足备份频度要求的数据集