If Disk Drill warns that the external hard drive does not have enough space, either free up space on the external drive by deleting files, or find another hard drive with more space. If there is sufficient space, Disk Drill begin backing up your Mac, making an exact copy of your hard drive on the external drive. This process is time-consuming, so sit back and relax while Disk Drill does the heavy lifting.
You can back up files on your Mac using Apple’s own built-in backup feature, called Time Machine:
- Connect a suitable backup drive to your Mac.
- Launch System Preferences and then click Time Machine.
- Click Select Backup Disk and pick your backup drive.
Keep in mind that the first backup can take a long time to create, especially if you have many files on your computer.