Best Practice to take back up Before deleting any data in Table

Before deleting any data in table it always Best Practice to take back up

So here is the Sample SQL 

Creating a Temp Table

CREATE TABLE SYSADM.PS_PO_HDR_TMP AS SELECT * FROM SYSADM.PS_PO_HDR WHERE BUSINESS_UNIT = 'MN300';

Make sure Table is created with Expected rows of data

SELECT * FROM SYSADM.PS_PO_HDR_TMP;

Delete rows from main table to remove data of backup data

DELETE FROM SYSADM.PS_PO_HDR

WHERE (BUSINESS_UNIT,PO_ID) IN  (SELECT BUSINESS_UNIT,PO_ID FROM SYSADM.PS_PO_HDR_TMP);