Sure! It makes no sense to keep backups that old.
You should any way make a backup to an external media.
Thanks for your very quick response !
I regularly performs backups of this catalog in the Backups folder (on the same disk).
Making backups to the same disk as the original is an extremely risky practice. If that disk ever fails, then you have zero copies of your catalog file, and I'm guessing that you won't be happy with that.
Well, sure !
Thanks DJ. In fact, I perform a second backup on a external HD by RAID system.