Backing up your Mac is simple and important. We recommend it for everyone.
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Back up with Time Machine
Time Machine is the built-in backup feature of your Mac. It’s a complete backup solution, but you can use other backup methods as well.
Create a backupStore files in iCloud
You can also use iCloud and iCloud Drive to store files, such as your photos, documents, and music.
![Mac Mac](/uploads/1/2/6/6/126637199/286413721.jpg)
Restore your Mac from a backup
When you have a backup, you can use it to restore your files at any time, including after the original files are deleted from your Mac.
Restore from a backupApple Computer Mac Air
Prepare your Mac for service
Making a backup is an important part of preparing your Mac for service, especially because some types of repair might require erasing or replacing your hard drive.
Get your Mac ready for serviceHow much space do I need for a backup?
To see the size of a specific file or folder, click it once and then press Command-I. To see storage information about your Mac, click the Apple menu in the top-left of your screen. Choose About This Mac and click the Storage tab. For Time Machine backups, it's good to use a drive that has at least twice the storage capacity of your Mac.
Related topics
Free up storage on your Mac
macOS can save space by storing your content in the cloud. This isn't a backup, but it includes new tools to make it easier to find and remove large or unwanted files before you make a backup.
Use Optimized Storage in macOSErase or format a storage device
You can use Disk Utility if you need to erase or format a storage device.
Learn how to use Disk UtilitymacOS Community
If you can't back up your Mac
We'll find the best support options for you.
Memory (RAM) and storage (hard disk / SSD) are not related to one another.
That Mac has plenty of available storage. If you are running low on memory Activity Monitor can be used to identify the memory-intensive processes causing that warning.
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To learn how to use Activity Monitor please read the Activity Monitor User Guide. For memory usage, refer to View memory usage in Activity Monitor on Mac.
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Once you determine the memory-intensive process or processes, a solution can be provided. WIthout that information it is premature to draw any conclusions, but the number one explanation for that warning is having inadvertently installed adware. To learn how to recognize adware so that you do not install it, please read How to install adware - Apple Community.