I use an external USB 2.0 harddrive and backup all on partitions c and d. I do a full once a month and differential every three days. I can almost understand the full backup and verify, but a differential writes the file in 15 or 20 minutes then takes more than 12 hours to verify. This is unbearable. I have compression and priority set to normal. Is there something I am missing? The same type of backups when I was backing up to tape with another backup product never took more than 2 hours and usually less. What can I try? Thanks.