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  1. or download this
    my $next_backup_file = "daily-incremental-backup." . 'date +%Y%m%d';

should be ...

my $next_backup_file = "daily-incremental-backup." . `date +%Y%m%d`;
  2. or download this
    my $youngest = "svnlook youngest $svn_repos";

...

my $youngest = `svnlook youngest $svn_repos`;
  3. or download this
    print 'gzip -9 $backups_dir/$next_backup_file';

...

print `gzip -9 $backups_dir/$next_backup_file`;