By luck, I checked the php error log and found that whenever I do a backup, I get a double entry in php_error.log showing the following:
PHP Warning: Cannot modify header information - headers already sent in D:\xampp\htdocs\msd\dump.php on line 452
The backup is successful and restores do not generate any warnings.
I have done a test second install of MSD and the errors are there. On my live host, no warnings are generated.
I am just curious if this is happening to anyone else.
I am communicating with the author of MSD.