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...
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"Never allow someone to be your priority while allowing yourself to be their option!"