I run my show from a MacBookPro and external HDD, and in the last few days had cause to regret not having a stronger disaster recovery plan

Periodically I copy my music collection across to one of a couple of backup drives, but it takes several hours to do this completely as there's about 1TB of data.
Can anyone recommend some decent, reliable software that will enable me to synchronise my 'backup' external HDDs with the main HDD that I use all the time, or is copying the way to go?
Also, is it worth using a UPS to power the EHDD, and can anyone recommend something suitable?
Sincere Thanks,
- G