where to connect external hard drive on IMAC?
what port to use for my external hard drive backup?
iMac 27″, macOS 10.14
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What year model is the iMac?
see > Identify your iMac model - Apple Support
To help you identify the various ports, including the USB ports on the various iMac models.
see > About the external features and ports on iMac and iMac Pro - Apple Support
Typically USB external drives are used for Time Machine and/or other backups.
If you have an older iMac, then you can plug a USB 2.0 or 3.0 external drives into one of the iMac's USB 2.0 or USB 3.0 ports.
If you have a newer iMac, then you can plug a USB 2.0 or 3.0 external drives into one of the iMac's USB 3.0 ports or plug a USB-C external drive into one of the USB-C ports.
