C:\Perl64\bin>Perl entities_99.pl
"my" variable $backupoutput masks earlier declaration in same scope at entities_99.pl line 11.
Use of uninitialized value $backupoutput in substitution (s///) at entities_99.pl line 11.
Use of uninitialized value $backupoutput in concatenation (.) or string at entities_99.pl line 17.
print() on closed filehandle OUT at entities_99.pl line 18.