使用完全数据库备份模型时，恢复数据需要这些备份。
These backups are necessary for recovering data when you use the full database backup model.
只需要简单地删除迁移了的模型并且利用在迁移过程中您所创建的备份模型文件。
Simply delete the migrated model and use the backup model file that you created during the migration process.
提出一种基于会话管理器的站点查询算法和分布式备份模型，保证系统可靠协作。
A query algorithm and distributed backup model based on session manager are proposed to guarantee the reliability of cooperative editing systems.
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