Best back-up disk for 2020 iMac desktop
Need a backup disk that's compatible with my 2020 iMac desktop running Big Sur OS 11.6. I recently bought a SanDisk Extreme Portable SSD 1TB and the volume is not compatible. Previously, I tried a G-Technology 1TB G-Drive mobile USB-C but it was "fried" when I tried to write data to it. Can anyone recommend a decent back-up disk to run with Time Machine?
iMac 27″, macOS 11.6