For using data dumper all you havev to do in order to get the data back is use eval to recreate
the data structure. Also of note you should also set $Data::Dumper::Purity to 1 if you have nested references
Here is a example:
#Save
use Data::Dumper;
$Data::Dumper::Purity = 1;
open FILE, ">$outfile" or die "Can't open '$outfile':$!";
print FILE Data::Dumper->Dump([$main], ['*main']);
close FILE;
#restore
open FILE, $infile;
undef $/;
eval <FILE>;
close FILE;
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