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Backups varying in performance speed

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We do a backup every night and we back up a lot of files on several servers (about 100 gb). We are using EMC2 Retrospect, Version 7.6.123 on WindowsXP with a sony StorStation AIT-4 drive. On average the speed has been 133 MB/minute, which takes between 11-12.5 hours. Then it will suddenly start backing up at an average speed of approx. 950 MB/minute, which takes just under 2 hours. This usually lasts about 6 or 7 days before it goes back to 133 MB/minute. It seems that it goes back to the slower speed after restarting. Has anyone else been experiencing this? Thanks in advance.

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