Canon MG5100 series On-Screen Manual page 565

Save to a Subfolder with Current Date
Select this checkbox to create a subfolder in the folder specified in Save in with the current date and
save scanned files in it. A subfolder with a name such as "2010_01_01" (Year_Month_Date) will be
created.
If this checkbox is not selected, files are saved directly in the folder specified in Save in.
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