The tablet will retain sales transactions as well as sending the transaction data to the management system (with communication availability). 

A preset level of transaction data will be stored locally on the tablet and when that limit is reached the tablet will ask the user if additional memory should be allocated or should the transactions be purged.

Reports available on the tablet are based on the unpurged data so many merchants set the purge level at a number equivalent to a day's work of activity (often set at 50). Please note that the transaction history is sent to the management system (CAS) regularly so purging data will still allow the user to access sales transaction information from the reports available on CAS.