There are two types of incremental backup.

有两种类型的增量备份。

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We propose two types of backup policies: the overlay policy and the joint policy.

我们提出了两种类型的资源备份策略：分层备份和联合备份。

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We propose two types of backup policies: the overlay policy and the joint policy.

我们提出了两种类型的资源备份策略：分层备份和联合备份。

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