它是指在用户正常使用的业务系统不受影响的情况下，能够对业务系统中的业务数据进行数据备份的时间间隔，或者说是用于备份的时间段。备份窗口根据操作特性来设定。
缩短备份窗口，保证备份速度及数据安全性，降低备份成本。
It decreases the backup window, ensures the data security and consistency, meets the needs of data backup at low cost.
文件系统通常为递增备份，这是为了最小化备份窗口和优化存储空间。
Filesystems are generally backed up incrementally to minimize the backup window and to optimize storage space.
研究了备份粒度控制。讨论备份粒度的划分依据，根据备份窗口和系统稳定性划分备份数据，使备份粒度满足系统要求。
Study the control of backup granularity and demarcation criterion, and divide backup data to satisfy the system requirement according to backup window and system stability.
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