备份集的大小没有限制。
压缩的备份只对备份集有效，对映像副本无效。
Compressed backups work only with backup sets, not image copies.
除了这项事实，每一次备份集都包括了“具有它的所有档案”的整个档案系统树。
Despite this fact, each backup set includes the whole filesystem tree with all its files.
除了这项事实，每一次备份集都包括了“具有它的所有档案”的整个档案系统树。
Despite this fact, each backup set includes the whole filesystem tree with all its files.
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