SnapCenter Functionality

I am in the process of trying to get SnapCenter working (and what a fun journey that is!). Despite being far along in the process, I still have some questions about what SnapCenter is doing. Below are my questions; if anyone if willing to take a crack at them it would be very appreciated. I am seeking answers that are simple and avoid a lot of NetApp specific terminology. (Caveat: Everything in the environment is virtual machines. We are only backing up VM's and it is all local. All NFS. VCSA 6.0u3 + SnapCenter 3.0.)

1. Where is the data stored? You set up your resource groups, policies and connection to the SVMs. So, where are the actual backups stored? Are there individual snapshots for each server in an SVM? very confused on this point. 
2. What happens to NetApp snapshots? When the NetApp installers came we set up local snapshot policies on the NetApp as a stop gap solution. With SnapCenter being stood up, do we need to remove those old policies? Are they redundant? SnapCenter does not seem to 'see' them (as far as I can tell).  
3. Is it better to setup the Snapmirror policies with SnapCenter or in NetApp System Manager? What is this difference?
4. How come SnapCenter doesn't seem to 'see' anything that has been set up in system manager? Is this by design or am i doing something wrong? (Thinking about the snapshots, snapmirrors, and snapvaults that are already in place) 
5. How come, without resource groups, when I back something up in SnapCenter, I can see/restore from SnapCenter but vSphere doesn't see them. 

That's it for now. Overall feeling on the product is that it is not really convenient for people who are not NetApp professionals. We are a very small shop and as the sole ‘systems engineer’ products like this that have a higher learning curve are more difficult to integrate and use.  I think making the install easier and more guided, combined with a simple run down of what the heck SnapCenter does (from a logical, no acronyms, nothing specific sense) would be very helpful. (What I mean is that, after 2-3 weeks of diving through documentation and trying to setup SnapCenter, I couldn’t give you a simple explanation of how it works and too me, that is bad.)

Thanks for any help!