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Backup file smaller than expected?

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Preparing to perform a full backup with TI 21 the "Backup" screen shows 71GB of data selected on my machine. The size of the resulting backup file is 36GB- which I don't understand

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The backup file size can be correct depending on the mix of files on your system and if you are using the default Exclusions set by ATI 2021 which excludes a number of large files that are not needed due to being recreated when Windows is booted, i.e. pagefile.sys, hiberfil.sys and swapfile.sys.  The default exclusions also omit all System Protection restore point data which can again consume a large size on the OS drive,

You can use a utility program such as TreeSize Free to see the sizes of the excluded files.

If you have large numbers of text or similar documents, these typically will compress very well to a fraction of their original size.