bluffwood Posted June 4, 2009 Report Share Posted June 4, 2009 I created a scheduled, 3-volume disk backup script to a USB external hard drive. The script has file compression turned on. The script log reports the backup of the first volume (drive C) gets compressed but the backups of the final two volumes (drives D and E) do NOT get compressed. The actual space occupied by the backup files agrees with the log. Is this a known bug? Can I work around the problem by creating separate backup scripts for each of the volumes and directing them all to the same Backup Set? I'm using Retrospect Express 7.6.123 with Windows XP Home SP3. Thanks for any input! Mark Quote Link to comment Share on other sites More sharing options...
Mayoff Posted June 4, 2009 Report Share Posted June 4, 2009 Compression does not have a bug as you describe it. Retrospect uses compression filters. If the data contains pre-compressed data, then it will not be compressed again. Quote Link to comment Share on other sites More sharing options...
bluffwood Posted June 5, 2009 Author Report Share Posted June 5, 2009 (edited) Mayoff, thank you very much! You are correct, as expected. I never dreamed my D and E drives contained minimal numbers of compressible files but that appears to be the case. I tried backing each drive up by itself with compression turned on and the resulting backups still had 0% compression. I now agree compression works properly with multi-volume backups. Edited June 5, 2009 by Guest formatting for readability Quote Link to comment Share on other sites More sharing options...
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