To conserve space on tapes, the CA VM:Backup system administrator can specify that CA VM:Backup pack data it backs up. CA VM:Backup uses a general purpose packing algorithm that eliminates repeating characters (such as blanks) in a data file by replacing them with a 3-byte field. Packing yields a significant compaction of data for almost all types of data. You can use data packing with all backup formats. Specify the data packing option in the job template or exception file. For information, see the chapter "Restore Job Template Files" in the Template Programming Interface Guide.
If hardware compression is available to you through IDRC-capable tape drives, you can still have CA VM:Backup pack the data; however, the job run time and the number of tapes needed for the job may increase. Experiment with a variety of jobs to see which settings give you the right balance between job run times and number of tapes produced.
During a restore, CA VM:Backup automatically detects that the data is packed and unpacks the data before restoring it.
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