这能够减少备份系统所需的磁带量。
This has the effect of reducing the amount of tapes needed to backup systems.
磁带提供与磁盘系统不同的技术区别，离线备份能够解决安全和数据保护问题。
Tape provides another technical differentiator from disk systems that addresses both security and data protection concerns: a completely offline copy of data.
或者可以挂载快照文件系统并将其备份到磁带（例如通过 Tivoli Storage Manager）。
Or, you can mount the snapped file system and perform a backup of it to tape (via Tivoli Storage Manager for example).
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