Thanks everyone for the help.
I have a solution, but it's not along the lines suggested. The real problem 
here is we have 1 pool for all the backups going back years. Disturbing that 
pool, as we've seen, causes data already backed up to be backed up again. So I 
am approaching it differently, and probably the way it should have been at the 
start - don't have 1 eternal pool. Since these are CCTV backups, I plan now to 
have a separate pool for every 6 months. Then when/if the online files move, we 
make sure only 6 months worth go, so in effect the pool can be recreated as for 
us that's only 4 tapes.

I hope this proves useful for someone else in future.

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