数据文件和系统的备份应注意 ( )
A.日常的定时、定期备份
B.定期检查备份的质量
C.重要的备份最好存在一个固定介质上
D.注意备份本身的防窃、防盗
E.多重备份,分散存放,由一个人保管
正确答案是ABCD
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