如果将数据备份按备份数据量划分，可分为四种，其中（ ）花费的时间最长、成本也比较高。
- A.差分备份
- B.增量备份
- C.完全备份
- D.按需备份
正确答案及解析
正确答案
解析
本题考查数据备份的类型。
差分备份：每次备份的数据是相对上一次完全备份之后增加和修改的数据。
增量备份：每次备份的数据是相对于上一次备份后增加和修改的数据。
完全备份：是对整个服务器系统进行备份，包括对服务器操作系统和应用程序生成的数据进行备份。
按需备份：不是针对整个系统而是针对选定的文件进行，是根据有选择地进行数据备份。
综合分析，本题选C。
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