For personal stuff, that is, my computer at home. I do not want to waste so much of my system's resources with complex, and lengthy backup schedules as they do at work. I see that all your stuff, except for the videos, would fit in an external 1TB hard disk. I would advise that you backup what you can you cannot replace or data you cannot deal with if you lost. I backup all my documents on a drop box account. I also have a free 50GB Box account
If you have the resources for a complex backup scheme, then i recommend that you add a second NIC on every computer that acts a a media server, get a good gigabit switch and connect those new NICs to the switch and then build a NAS that is quick, and connect the NAS to that switch. Separate your backup data from your internet/wifi data to reduce the ACK noise. I am only suggesting.
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