I have a 2 hard drive computer. A small solid state drive to run the operating system (windows 10) and 2 terabyte traditional hard drive where I store my audio files and projects. I also use this PC for editing pictures and videos and I store the files on the same drive. The hard drive is getting full. I would like to have a hard drive where I could save all my files and a second one for redundancy backup. I would like at least 2-4 terabyte of disk space on each drive. I do not mind if it is SS or traditional as long as it is reliable. What should I get that is reliable and not crazy expensive?