At my previous institution we imaged almost everything BSA related, including e-mails, memos, info requests, etc. sent to account offciers....but we NEVER, noe would I have allowed them to image the SARs. I too had a SAR file for each SAR completed that contained all of the documentation pertinent to that specific SAR. In addition I also had an electronic version saved on my own protected drive, but that was only because we completed an electronic version of the form.
Hope this helps...
"Never allow someone to be your priority while allowing yourself to be their option!"