Yes - if a contact that has been deleted and there were tasks associated to their deleted contact record, when the contact is restored then the tasks will also be restored inside the contacts record.
If you have deleted a contact and need the contact to be restored please contact our Support Desk with the contacts name so that we can restore the record for you.
If you would like the ability for the Admin Users to be able to restore deleted contacts then we can provide this functionality for the cost of £150 + VAT. Please contact our Support Desk if you are interested in having this feature.