If you are looking at saving data to disk in a hash structure, my recommendation is to use DBM::Deep.

It's pure Perl, fast and very stable.

use strict;
use warnings;

use DBM::Deep;

my $dbm = DBM::Deep->new('mj-test-schedules');

$dbm->{'some_key_name'} = 'some value';

for (keys %$dbm) ) {
   print "$_ => $dbm->{$_}\n";
}
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