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radical drop in backup size

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In late October, my computer backup was 83 GB. In November it was 34 GB. Cannot account for any sizable change. Email and Data backups have been growing normally in size with time. Acronis says computer backup is currently 38 GB, but My Computer window shows 69 GB. Can someone explain sharp drop in backup size? Windows Vista, HP Pavilion.

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A full backup of your entire disk should be approximately 60-65% of your used space. Audio or video files will compress the least. Have you added any file exclusions, etc so your backup is less in size?