It's perfectly plausible for the Full backup to be somewhere inaccessible (for example, in a fireproof safe) during an Incremental/Differential run. And given that the paths (and we optionally provide more than one...) could contain Variables (that might be scripted) that might evaluate completely differently (and unpredictably) on different days - and so on - we only check for the location we're pointing at ('supposed to use') at the time. Too many potential permutations, otherwise.
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