Backing up laptop to external disk connected to iMac using Time Machine
I can't figure this out, any help appreciated.
I am trying to setup an external disk attached to an iMac as a backup disk to be used by Time Machine on my laptop.
I have added the disk to File Sharing via System Preferences and clicked the disk > Advanced Options and selected Share as Time Machine backup destination.
I've added the administrator as having Read & Write access.
I can select the disk from Sys Pref > Time Machine from my laptop and when I enter the admin credentials, they're accepted.
However when the 120 seconds countdown and the backup tries to start, I get these messages. I have tried just about everything. Has anyone had any experience with this? Very frustrating, thanks!
iMac with Retina 5K display, macOS 10.15