Long restore times
If a restore takes an unusually long time (for example 20 hours instead of 2 hours), the media speed between the adapter and the switch or hub where it connects may not match. For example, the media speed is set to 100 MB full duplex, but the restore slows down because the hub uses half duplex. Change the media speed to match the hub speed or switch speed, or change the hub-switch setting to match that of the client.