You should probably still try it occasionally :). For one of my team's services, we don't just back up the data: we then also restore it into a parallel enviro

You should probably still try it occasionally :). For one of my team's services, we don't just back up the data: we then also restore it into a parallel environment. If the backup fails, the restore fails, and then the environment fails, and while our monitoring might miss some instances of spurious success, it's less likely that the whole chain will look like it's working if the actual backup is not actually working.