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KnapSac can backup an OpenVMS disk to a Windows disk up to 20 times faster that the Backup utility can perform a similar disk-to-disk backup. A backup which takes hours using the Backup utility can be done in minutes using KnapSac. The chart below compares the elapsed time to backup a 31 Gigabyte user disk to Windows using KnapSac and a disk-to-disk backup of the same user disk using Backup. The comparisons were done on an Integrity Server running OpenVMS 8.3.       1 Gb Network Link       
KnapSac - compare the speed