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exiftool

# COPY all files with missing EXIF [date taken] in current folder and 
# subfolders to YYYY/MM/YYYYMMDD-HHMMSS.extension
# and writes EXIF [date taken] to file modified date
#
# Flags explanation:
#
# -o  when combined with '-d' flag, forces copy operation, 
#     alone just specifiec output folder
# -P  Preserve file dates
# -r  recursive
# -if logical statement for operation
#
# Arguments explanation
#
# 'not $DateTimeOriginal'
#   checks if file does not contain EXIF Creat date
# '-FileName<FileModifyDate'  
#   use file modified date as file name
# '-DateTimeOriginal<FileModifyDate'
#   write EXIF Create date tag using file modified date

exiftool -o . -P -progress -r -if 'not $DateTimeOriginal' '-FileName<FileModifyDate' '-DateTimeOriginal<FileModifyDate' -d "%Y/%m/%Y%m%d-%H%M%S%%-c.%%e" .  

# COPY all files in current folder and subfolders to YYYY/MM/YYYYMMDD-HHMMSS.extension
# and changes Date Created to date taken from EXIF info
exiftool -o . -P -r '-FileName<DateTimeOriginal' '-FileCreateDate<DateTimeOriginal' -d "%Y/%m/%Y%m%d-%H%M%S%%-c.%%e" .