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How tape backup works with data compression

When you backup compressed data to a tape through the SMTape engine, the data format of the source volume is preserved on the tape and all compression savings are retained on the tape.

You can restore the compressed data from a SMTape to a destination volume and the saving will be retained. You must enable inline compression only if you want the new data that is written from the client to be compressed on the restored volume.

When you backup to a tape through NDMP, the data compression savings are not preserved on the tape.