Freenas Hardware

I have a nas4free 32bits whith 1TB drive UFS (700GB used) for files and another one 1TB Rsync 24h , Motherboard H110 Pentium G4560 4GB RAM 2100MHZ 1GB/s LAN. I copy it with acronis by incremental to a 1TB drive on a windows desktop every day. And one time a week I copy a full copy to a external USB 3.0 4TB drive, Its run about 5mb/65mb per second expendind much time, so much litle files. What I can do for ugrade?