这命令有多个选项，您可以选择进行完整备份或增量备份，脱机备份或联机备份。
You have several options for these commands to enable you to do full or incremental backups, either offline or online.
注意，每当使用import命令将一项内容存入Subversion中，就是存储该项的整个副本，而不会尝试以增量形式存储它。
Note that whenever an item is put into Subversion using the import command, a whole new copy of the item is stored, with no attempt made to save it as deltas.
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