"Capable backup" refers to a dependable and skilled alternative that can substitute or support the main person or thing in case of need or emergency. Full definition
That means they lost better players, and they also have capable backups who didn't have much game experience to replace them. (sbnation.com)
That would be enough, but add in Miles Sanders who would be the starter at just about any other school, as well as some very capable backups in Andre Robinson and Mark Allen, and you've got a loaded backfield that will be an absolute force. (sbnation.com)
The fact is the team needs a proficient striker and an EQUALLY capable backup for for coq.. (justarsenal.com)