As mentioned, there's no rule for it. Old rules (at least for some edition of the game...) were "use the base the model was supplied with", which is a sensible approach but I'd say unless it involves a lot of work (rebasing an entire army, ie my Necrons all being on 25mm bases, or you put a lot of effort into the basing itself) then I'd say update to the current base size of the model.
I am planning to update my Necron armies bases eventually though... When I'm finished with my Minotaurs... So probably never >>;
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