架构会在某个阶段备份编辑缓冲区，如此它可在必要时还原其内容。
The framework backs up the edit buffer at certain stages so it can restore its contents if necessary.
可以创建多个快照，如果需要对系统执行多次更改并在每个阶段创建相应的备份，那么创建多个快照将很有用。
Multiple snapshots can be taken, which can be very handy if you need to perform multiple changes to a system with corresponding backups at each stage.
通过在迁移的每个阶段都进行备份，您可以回滚到迁移过程中的任何特定时点。
Backups at each stage of your migration enable you to rollback to a specific point in time of your migration process.
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