What to do
My Macbook's battery is at 519 charge cycles with a (fluctuating) <20% design capacity and doesn't charge anymore. So I decided to get it replaced. I was told that it was recommended to do a backup of my computer on an external hard drive and I was wondering if an external hard drive is my only option? What are some recommended brands/types of external hard drives? Is that all I have to do before getting my battery serviced?