a 2tbytes attached to router costs about $200. I then mount desktop and my documents on pc we have to it.
the Mac can also mount drive but sadly not as fluidly as above.
for pads and phones use ' es file explorer' folk can decide which video
I have separate 2tbyte attached to nas via usb so backup using rsync every month ( then pop into loft ).
in home use cabling around house so heavy duty editing of video and raw photos don' t suffer lag.
key principal is everything on nas is ' safe' ( but see loft thing) everything local is copy.
figured out how to share music playlists between devices with a partial view of all content available. cannot recommend vlc for desktop and poweramp for android enough.