My earlier post was clear that it is unnecessary to copy an FAC, no paranoia just it can lead to problems.
On HOA renewal for three rifle clubs recently we discussed both the copying of certificate and access to FAC details. His advice was very clear hold only that necessary, check not record if possible and separate details, Lastly, keep them from prying eyes. Everyone wants to know what you've got on your ticket.
We discussed an incident which happened to me and my son. Simply, rifle on both our tickets, stored in armoury at a rifle club. Club official not sure of legislation entered our rifle on the club FAC (it had approriate slot as it was club ticket). He entered details onto that certificate and informed police. Son left club and brought rifle home. Son wanted variation some months later, received FAC back and guess what, rifle had been removed. As it was shared with me, I contacted my constabulary and again removed from my ticket. Had to then sort it at two constabularies, simply because that person didn't understand things.
I asked what would have happened if that person had removed it from the armoury and taken it. The FEO was clear, he had your FAC details and serial number so they would assume I had sold it and then regretted it. The police would therefore do nothing. The club official didn't have my sons FAC but did have everything necessary to make a transfer except a signature which of course is not validated on a firearm transfer.
Any person having access to your FAC details and your rifle can lift it and claim it is theirs. All that they need to do is copy your signature. Oh I forgot, you gave them a copy of your signature when you allowed them to copy your FAC!