How is it best to store confidential data that you would need access to on a daily basis? The data needs to be shared across systems. Is google drive secure enough?
Does it need to be shared wireless-y across systems? If not, just get a USB drive and keep it safe. If it does need to be wireless, maybe a NAS? That might not be the most economic solution though, I'm sure there's a piece of software that allows it but I'm not aware of one.