In reply to goosebump:
before you splash out on a NAS box, there are a couple of questions you should ask yourself.
The first one, is how much information you have to begin. This includes everything you hold most dear in the digital world. Once you have a number, then double it and this should be a starting point for the size of NAS storage you may need with space to grow over the coming years.
Next question is, do you want a Network Access Storage Device or a Network Storage Drive?
I have only just learnt about Network Drives and these are basic devices with a single hard drive, while NAS boxes have two or more drives.
Personally I, would and, have gone with a NAS box containing two drives. I also have these two drives working in such a way that they both hold the exact same information on both. So, if one drive dies then the other will save the day because it is a mirror image of the other disk. The only drawback is that you halve the storage space in the process. So, if you have a 2TB NAS box and everything is mirrored then you really have 1Tb of storage to play with. The theory is that if one drive dies then you replace it with a brand new disc of the same size/speed, and the NAS box does its magic by filling it with all the information from the drive that did NOT die.
This set-up saved the day when one year the dog panicked and knocked the NAS box killing one of the hard drives stone dead.
If you have a Network Drive, with only one disc, and that disc breaks then there could be tears at bedtime.
When I bought my NAS box I went for two drives with 4Tb of storage. This gave me 2Tb to play with once I had them backing each other up. At first I thought this would be plenty. But within a couple of years I was scratching for space. This forced me to buy a couple of 3Tb drives. Its amazing how easily it is to hoard stuff and refuse to delete it.
I too have a SONOS set-up connected to my NAS box. Its great playing music on my SONOS set-up without first having to fire up the PC. Its pretty cool watching movies or TV shows on my Tablet, again without worrying if the power hungry PC is turned on.