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The value of the BACKSCAL keyword can be calculated via the SAS task backscal. This task must be run on any spectral files created by evselect. Please, be aware that the on-line help of evselect still refers to an obsolete input parameter calculatebackscal, which no longer exists.
If you have created the spectral file with xmmselect, however, you may not need to run backscal on it. By default, xmmselect runs automatically backscal upon extraction of a spectrum. An item to disable this option can be found under the Products menu in the main xmmselect window.
The BACKSCAL value can be at any moment modified through,
e.g., the FTOOLS fparkey, or grppha