Hi @Vitor,
It isn’t necessary to delete the records form device.
The records memory works as FIFO, so, the oldest record will automatically deleted when memory is going full.
But, if you want you can delete all records manually in Crosschex menu: Device-> Device parameter->click on “Clear the attendance records” button.
You can read more about automatic download here: https://community.anviz.com/t/crosschex-standard-quick-tips-download-and-export-records-automatically/104