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Welcome to the Apple Support Communities.

Delete CleanMyMac [Instructions] and Surfshark VPN. Mac computers do not need anti-virus, cleaners, VPN Apps, etc.

Also, make sure you have a backup strategy in place! The best way to create a backup is using Time Machine: Back up your Mac with Time Machine - Apple Support. For Time Machine, you need an external hard drive. Apple sells external hard drives. Here are some options:

Mac computers with USB-A and/or USB-C Connectivity (these drives ship with USB-A and USB-C Cables):

• G-Technology G-DRIVE mobile USB-C Portable Hard Drive - Apple (available in 1TB, 2TB, 4TB, and 5TB)
• G-Technology 10TB G-DRIVE USB-C External Hard Drive - Apple (available in 10TB)

Modern Mac computers with USB-C Connectivity (these drives ship ONLY with a USB-C Cable):

• LaCie Rugged USB-C Portable Hard Drive - Apple (available in 1TB, 2TB, 4TB, and 5TB)
• LaCie Mobile Drive External Hard Drive USB-C - Apple (available in 2TB, 4TB, and 5TB)
• LaCie 8TB d2 Professional Desktop Hard Drive - Apple (available in 8TB)

If you need help understanding what connectivity and ports your Mac has, see: Identify the ports on your Mac - Apple Support.

Regardless of which drive you choose, it needs to be formatted. Follow these steps:

1. Go to Disk Utility (Finder > Go > Utilities)
2. In Disk Utility, select “View” > “Show All Devices”.
3. Select the top and non-indented drive in the external section of Disk Utility that matches the name of your external drive. 
4. Click Erase
5. Name: any name you want
6. Format: Use Mac OS Extended (Journaled) if you are using macOS Catalina or earlier, or APFS if you are using macOS Big Sur.
7. Scheme: GUID Partition Map
8. Click Erase

Finally, setup Time Machine: Back up your Mac with Time Machine - Apple Support.

Jack

Mac computers do not need anti-virus, cleaners, VPN Apps, etc. They ruin macOS and make it appear buggy.