Which storage device to buy?

I would greatly appreciate assistance in choosing the best storage product for me.
** I own a iMac with a 2TB hard drive
** I am looking for more storage space plus backup
** I am presently using 3 external drives - 2TB Airport Time Capsule, 2TB WD drive and 1.5TB LaCie drive
** I do a Time Machine backup of only data files to the Time Capsule; a full backup of my internal hard drive to the other 2TB drive using a 3rd party program  - this drive is bootable; the 1.5TB drive stores my videos, no backup done of these files
** I have about 1TB in music files and almost 1.5TB in video files
** There are 2 immediate issues - a) I will soon run out of space on my LaCie for video files and, b) the video files are not being backed up.
** A future issue to consider is I might sell my iMac with 2TB storage and use MacBook Air with much less storage space available internally.
** I would like 1 backup of every file, 2 backups of my music files which I consider invalulable and might as well kill myself if I lost them, haha.
Any suggestions appreciated.  I was pondering the My Cloud EX or an NAS, but I have no need to access the files from another computer or device.  I like the idea of having RAID, not that I'm all that familiar with it.  Thank you.

If you need portability you want a MacBook Pro or MacBook Air. A Mac mini is not portable and an iPad2 while a great device isn't what I consider ideal for software development. If you need a lot of storage you best bet would be a MacBook Pro, then you just have decide what size screen you want. Finding 1TB 2.5" drives is a little tough, you won't be able buy the machine with a 1TB drive pre-installed you will have to upgrade which is pretty easy on a MacBook Pro. You can find one (a Samsung) from OWC at www.macsales.com.
Also this is an iMac forum, posting here for a portable device doesn't make too much sense. I'd recommend the MBP or MBA forums.

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