QuickBooks allows you to create Previous Reconciliation report that shows how you reconciled an account for a previous reconciliation period. This is one of the reports that you can refer to when troubleshooting reconciliation issues or when you are looking for discrepancies.
Transactions cleared at the time of reconciliation
Transactions cleared plus any changes made to those transactions
QuickBooks Premier, Accountant and Enterprise Solutions give you access to the last 120 Previous Reconciliation reports.
QuickBooks Pro only allows access to the last reconciliation report created. To keep a copy of other reports on your hard drive, you can save it as PDF. Other options are Exporting the report to Excel or upgrading to QuickBooks Premier or higher.