in reply to Desination file with space in directory name

Try

system( qq[copy "$sourceFile" "$destinationFile" > nul] ) == 0 || die "Database did not copy: $!";

Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
Lingua non convalesco, consenesco et abolesco. -- Rule 1 has a caveat! -- Who broke the cabal?
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.