Your backup system sounds fine. Make sure you're doing incremental backups to cope with viruses, and schedule restore tests in your calendar.
Do you cull your photos and videos? 1.5TB is a heck of a lot. I delete about 75% of the photos and videos I take. If you do it every time you upload to your computer it's fairly quick and easy, if you have to do years of it at once it's a mission.
