I have a question about an external hard for time machine
I'm running Mac OS Catalina on a 13" Mid 2012 MBP and it's about to be replaced with the the 2020 13" MBP. I have two 1000 GB external hard drives. I need to know how to format them. I'd like to keep a time machine backup of the mid 2012 MBP just in case and I'd like to start out fresh to do time machine backups for the 2020 MBP. How do I format these two drives? One is a Seagate and one is a G Drive. Thanks in advance. Linda
MacBook Pro 13″, macOS 10.15