The cause can be one of a number of things, including a third-party app interfering with Time Machine, corrupt files, a system freeze, or one or more drives that weren't properly
Ihe kpatara ya nwere ike ịbụ otu n'ime ọtụtụ ihe, gụnyere ngwa nke atọ na-egbochi Time Machine, faịlụ rụrụ arụ, nhazi usoro, ma ọ bụ otu ma ọ bụ karịa ọkwọ ụgbọala ndị a na-ekwesịghị ịpụpụ n'ụzọ kwesịrị ekwesị.