对于任何数据库管理系统来说，备份和恢复功能是确保数据可恢复性的关键。
Backup and restore capabilities are key to ensuring data recoverability for any database management system.
数据管理涉及多种领域的专门技术，比如备份和恢复、数据库设计、服务提供商选择。
Managing data requires specific skills in many areas, such as backup and restore, database design, and choice of service provider.
邮件数据库越大，管理团队管理备份和维护环境就越困难。
The larger the mail databases, the more difficult it is for the administration team to manage the backup and maintenance of the environment.
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