You will need to do an incremental extract. More information on this can be available here :
Another related piece of information you may need is also how to properly refresh extracts from excel files
You can search for more on these topics.
Hope it helps.
We’re using version 10.4. Can a monthly excel file be used
for the incremental refresh?
Also when I try to refresh on the server, I get the following.
Extract Refresh Failed. Site Default. Error Message: Unknown failure.
The event log on the server shows:
Event ID 4096 from source Tableau Server (Filestore) cannot be found
Event ID 4096 from source Tableau Server (Backgrounder) cannot be found