SalesVu can be used offline for cash transactions. It is required to have an active internet (WiFi or cellular data) connection to process credit cards as they need to be verified in real time and also to sync app with web portal.
If an Internet outage is a huge concern for your business then we recommend to purchase a backup Internet connection. If your regular Internet ever goes down, you will switch to other network. On the US market, you can find deals with 1GB free per month.