My customer has an SBS 2003 SP2 server and uses SBS backup to backup to 5x USB hard drives, one for each day of the week. They use digital imaging in their accounting practice, so the data set is steadily growing and the backups are taking longer.
The current backup starts at 9pm and finished this morning around 5am. Last night's backup of 22GB from C: took approx 3hr 30mins and 77GB from D: took approx 3hr 45mins. This works out at approx 1.7MB/s for C: and 3.75MB/s for D: and an average of approx 3.8MB/s.
I believe that USB 2.0 hard drives should be able to realistically manage around 30MB/s and this backup is no where near that.
I have viewed Device Manager 'by connection' to make sure that the USB hdd is connected to the Enhanced USB controller. I have hacked bkrunner.exe to turn off the verify option and edited the SBS Backup User's NTUSER.DAT file for some performance tweaks. Both of these ideas came from the following link:
The above mods has improved things dramatically - previously the backup wasn't finishing until after 11am the next day.
But it seems that the drives are not running anywhere near their best speed.
Does anyone have any ideas how I can help the situation?