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Which of the following statements are true about the BACKUP command? (Choose all that apply.)
A. The BACKUP command can not be used to make image copies of a datafile.
B. The BACKUP command can improve performance by multiplexing backup files.
C. The BACKUP can take advantage of the block-change tracking capability.
D. The BACKUP command cannot store data in incremental backups.
E. The BACKUP command can store data in cumulative incremental backups only.

　　The BACKUP command can take advantage of multiplexing datafiles to the same backup set.The BACKUP command can also use the block-change tracking capability.

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原文：http://www.cnblogs.com/Babylon/p/7810740.html