Mac System Data

So I removed the files form “/Library/Application Support/com.apple.idleassetsd/Customer” but it keeps getting downloading back. Is there any way to stop the downloads? 

My Mac suddenly ran out of storage space. In the “System Settings” > “General” > “Storage”, “System Data” was over 100GB.

Found the issue: “Wallpaper” at /Library/Application Support/com.apple.idleassetsd downloaded tons of 4K 240fps videos.

1. Turn off the “Wallpaper” feature in System Settings, I set the pure black color as the wallpaper.
2. Delete these files

/Library/Application Support/com.apple.idleassetsd/
/Library/Application Support/com.apple.TVIdleScreen/
${HOME}/Library/Application Support/com.apple.wallpaper/Store/Index.plist

Credit to Holy Fox 

3. Restart the Mac.

Storage space recovered.

References:

• https://macreports.com/is-system-data-taking-up-50-100-gb-or-more-storage-on-mac-learn-why-and-how-to-clear-it/