Re internal or external CDR (or do I nee

I’m looking to purchase and install one or two CDRW units. One purpose will be to save data on a periodic basis for a Compac notebook and a tower IntelAsus ATX BX P2b98 -F- PII 350 – 8.4 GB C Disc
1. Can I copy discs from my present CD to an USB external CDRW?
2. Would it be more feasible to buy both an external CDRW USB plus an internal CDRW for my tower unit?