DB2 database stores data for 6 months, need to keep old data on refresh

Hello,

Our current method of pulling data is using a web connection via DB2. The issue I am having, is that the data in the database is only stored for 6 months. Is there a way in Power Bi to save the old data(Update table) upon refresh? I tried implementing incremental refresh but could not get it to work. My range start and range end could be wrong but I'm really not sure. Thanks for your help!