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Check your data
The most important fist first step is to check your data is all where you would expect it. Check your profile folders, such as Desktop, Documents, Videos. All data should be present due to User's Guide to Folder Redirection
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System Backups can take up a lot of space - often most of your local hard disk. It is good practice to delete it as soon as you are sure they are not needed. CSCS will keep a copy of your backup for 30 days after your reinstallation.