Backed adverbs are provided in this article. The words listed here are commonly found along with the verb backed in sentences. This reference page helps answer the question what are some adverbs that describe or modify the verb BACKED.
actually, carefully, consistently, enthusiastically, eventually
federally, finally, financially, fully, generally
hastily, heavily, immediately, initially, instinctively
promptly, properly, publicly, quickly, quietly
reluctantly, simply, slowly, solidly, strongly
suddenly, ultimately, usually
Hope this word list had the backed adverb you were looking for. In addition to adverbs used with backed, other example verb adverb pairings can be found on this site.
You can help by adding more adverbs in the comments. Thanks.