iMac dated 2019, Sequoia 15.3.1. External Seagate BUP Slim Mac SL... drive. PROBLEM: For a week, my iMac won't restore to my Seagate.Yesterday I got a message about not having enough app memory, but I am doing nothing new and have very few apps open. I erased the Seagate and failed at restoring it. Watched a vid, still can't restore it. I tried using Mac OS Extended with GUID partition and other combinations of format and scheme but I either get "failed, try when Seagate can be found" or I can restore with Apple SSD...etc, whatever that is. Any links to show me a process that works? Am confused. Thank you.