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You can use the EXCLUDE-JOB, -PGM, and -MOD tables to prevent BACKUP/RESTORE facilities from doing compression or expansion. The backup functions of CA FAVER, DFDSS, and CA Disk retrieve data from a compressed cluster without expansion and store data compressed. However, their restore functions use VSAM record management to store the compressed backup data back into the cluster at restore time. CA Compress is invoked when the VSAM cluster is opened for output. Unless the restore functions of such products are excluded, compressed data from backups is compressed again.
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