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The external storage device you purchased is formatted NTFS, the native file format for Windows PCs. Your Mac can read the NTFS format but it can't write to the drive or delete files from it. You can format the storage device to give your Mac full read/write access.
|macOS starting version 10.13—Make sure to select the storage device and not just the volume. If you don’t see two entries listed in the sidebar, change the view in disk utility to show both the drive and the volume. The view button is in the upper left side of the Disk Utility window. Change the view to Show All Devices. This feature was introduced in macOS 10.13 and is not available in 10.11 or 10.12.|
Connect your Seagate storage device to your computer and you’re ready to back up your important files and folders. The fastest way to back up is to select items on your computer and copy them to your drive by dragging and dropping. If you want to make sure your data is continuously backed up, you can easily create an automated backup plan.
Time Machine is an automated backup feature built into your Mac. For details, see this Apple support article.