
To clean up the AppData directory, you can use the built-in Windows 10 Disk Cleanup Wizard. You don’t have to manually delete the contents of the AppData folder if you do not know how deleting the directory can affect the installed apps. It turns out that AppData stores data about a program that is no longer on the computer, and they take up space on the system drive. When you uninstall app through using standard tools, most applications don’t clean their data from the AppData folder.
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Moreover, the removal of a program or game from the computer doesn’t always lead to the removal of files from AppData. Windows itself doesn’t control the size of this folder, respectively, it can grow up to tens, or even hundreds of gigabytes. The more programs and games on your computer, the larger the size of the AppData folder. When you install and use each new application, the size of the AppData folder becomes larger. You can clean the AppData\Local\Temp directory without harming Windows. For example, the Local directory contains the Temp directory used by programs to store temporary files. The AppData directory over time accumulates quite a lot of temporary files and other garbage, which takes up a lot of disk space. The environment variable for this directory is %APPDATA%.

This directory allows the user to always work with the familiar environment on any server in the Remote Desktop Services farm when using roaming profiles or User Profile Disks. This can store browser data, bookmarks, etc. This application settings folder can be transferred (moved) to another computer. This directory also cannot be moved to another computer. It is also used by low-level access systems, for example, for temporary files of your browser when working in protected mode. LocalLow is used mainly for buffer data generated by various apps (Internet Explorer, Java, Adobe, etc.).
