Best program for back-up usable/accessible over NAS?

Apologies if this question has been addressed previously. Here's my current set-up and what I'm looking for: MacBook Pro running OS X Mavericks. I have Time Machine set-up for back up to a 2TB WD My Book. Once a week, I plug the HDD into the MBP for the Time Machine backup and the rest of the time it's plugged into our router acting as an NAS. This takes care of my restoration back-up needs. (it's not the most efficient system, but until they enable Time Machine backup over NAS it's my only option). However, we also have a lot of other movies, pictures, documents and other files from old PCs backed up to the NAS - essentially as a media share drive and old document repository. We are primarily a "tablet" family and use our iPads, iPhones, Kinde Fires, etc to access these movies, pictures, and files - again, maybe not the best system but it works for us. What I would like to do is be able to access the files, pictures, music, etc that are actually on the MBP as well (access EVERYTHING from my iPad). The Time Machine back-up files are also not accessible from any other devices (unless I'm missing something there) and I know sharing the MBP over the network is also an option, but since we mainly use our tablets the MBP isn't online most of the time. So, I'm left looking for an additional program where I can back-up specific files (music, pics, docs, movies mainly) to the HDD periodically so we can access them when the MBP is off the net. I've heard of CarbonCopyClone and Super Duper!, but was looking for input as to which might be better suited. Do either of them do back-up over NAS? Is either better/easier to set up for backing up only certain files with each to a specific location? Or are there other options?

I'm pretty much open to any input, including different/better courses of action that may suit my purposes. I'm moderately tech-savvy and can usually figure things out. But I'm a recent convert to the Mac computers, so I'm open to the experience and expertise of others. Thanks!