USB3 can be added to a pc by adding a card which fits in a PCI slot. You would need to buy USB3 peripherals to gain any benefit (and don't expect a 10x improvement).
Have you considered adding a second harddrive internally to use for your backup?
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Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.