"I have a seagate external hard drive, however it takes forever to take a copy of my hard drive files each time"
Confused about this - are you making new copies of everything, or just the new/modified stuff? What do you consider forever, since clearly its not literally that or you would never have a copy completed
Maybe there is something wrong with your external - or your on usb 1?
When it comes to family photos/videos - you should be more concerned with a full DR plan vs just backup. I have my photos/videos on 2 different systems here at house. I then have them in 2 different systems online - one being lower quality used to share the them over the internet, but it does count as a worse case scenario copy.
The other copy is original format 1080p 60fps.
I then also have a copy on optical media here in the house and copy at my sons place - just in case a tornado took my house to OZ, my 2 HDD copies and optical copies would be gone. I personally would not take optical media copy out of your solution.. I am thinking of moving to the new 1000 year disks to remove the concern of bad optical media. http://www.m-disc.com/
The other issue that comes to mind is not just backup of the files but that you can read/play the files no matter what media its on. So you have this .mp4 file encoded with h.264 -- are you going to be able to play that in 20 years? Even if you move the file to current media as it changes? At somepoint I would have to think conversion to newer format is also going to have to happen.
I think of these things as I have my 2 year old grand daughters videos, and wanting to make they will be around for her to show her grand kids.