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The Feat Ritual Caster doesn't seem to prohibit copying spells multiple times into the ritual book. Is there some other mechanic at play that would prevent multiple copies of the same spell from being entered into the ritual book? Or, even though it is not stated: is the ritual book just like a normal spellbook?
Could the character just use multiple books?
As noted in the comments, I don't see any benefit to having the spell copied multiple times in the same book (please correct me if I'm wrong). So long as the correct amount of resources are spent for each copying (or GM could rule reduced resources based on available experience, knowledge etc.) there is nothing stopping you from making multiple copies in the same book.
Extra Credit: The character could definitely use multiple books, and depending on the campaign it can be a great idea. If a spell book is stollen/ lost/ destroyed/etc. having the backup copy would be invaluable to allow for continued spell casting.
Nothing in the feat and no other mechanic prevents you from copying the same spell into your ritual book multiple times.
But most of the time, doing so is a waste of resources because when you have one copy of the spell in your ritual book, you can already cast it as a ritual.
Certain spells have a special tag: ritual. Such a spell can be cast following the normal rules for spellcasting, or the spell can be cast as a ritual. The ritual version of a spell takes 10 minutes longer to cast than normal. It also doesn't expend a spell slot
So you can already cast the spell multiple times when you have it as a ritual. To learn more about rituals, make sure to read the Ritual Section in the Basic Rules.
