Gi?ku?yu? has two types of backcopying? (1) optional backcopying (i.e., backcopied and non-backcopied variants are in free variation) when prenasalized stop formation (/Nt, N?/ ? [?d], /N?/ ? [?d?], /Nk, N?/ ? [?g]) and foot reduplication interact; (2) obligatory backcopying when prenasalized stop formation, foot reduplication, and Meinhofs law (NC? N?(C) ? N? N?(C)) interact. To account for the obligatory backcopying cases, I propose that the distinguishing factor lies in the onsets ratio of nasality in the base vs. the reduplicant. On a ratio-of-nasality scale of [t, k, ?, ?, ?] = 0, [?d, ?d?] = 1, [n] = 2, a Distantial Faithfulness constraint penalizes segments in RED that differ too much from their Base correspondents. Consequently, Base-Reduplicant pairs like [?d?] [?] are acceptable because their nasality distance is ?1, whereas [n] [?] is disfavored because the distance is 2.