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You don't need to use a printf style format string operand with logger, but you do need a then in your if statement.

if ! tmp "$FILE" "$TARGET/$TIMESTAMP/$DATE" > /dev/null 2>&1; then
logger...

It would seem that after the line:
$TRANSFER "$FILE" "$TARGET/$TIMESTAMP/$DATE"
you would want to run command something like:
if ! cmp "$FILE" "$TARGET/$TIMESTAMP/$DATE" > /dev/null 2>&1
...