Encryption of backup drive with time machine.
Do I need to encrypt a backup drive using time machine if my iMac is using fire vault encryption? It's been over eight hours and the encryption of my new Lacie external 4TB USB drive is taking forever. It was being backed up before I checked the encryption box and I understand that this will erase the older backups. I'm using Catalina 10.15.7 on a late 2015 27 inch iMac