trigger CustomerSuccessTrigger on DEPRECATE__Customers__c(after insert) {

List<DEPRECATE__Customers_Backup__c> customerList = new List<DEPRECATE__Customers_Backup__c>();
for(DEPRECATE__Customers__c customers : Trigger.new){

        DEPRECATE__Customers_Backup__c bckup = new DEPRECATE__Customers_Backup__c();
        bckup.Name = customers.Name;
        bckup.DEPRECATE__City__c = customers.DEPRECATE__City__c;
        customerList.add(bckup);

}
insert customerList;

}