用磁带机对ILAS系统进行数据备份有很多缺陷，数据的完整性、安全性差。
Backing up the datum of the ILAS system with tape driver has many defects, such as the incompletion and insecurity of the datum.
机械降解，造成有缺陷的设备或磁带坚持，老化或有缺陷的存储。
Mechanical degradation caused by defective devices or sticking tapes, by aging or defective storage.
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