Cards Ready does not collect or upload any of your data with the following exception: Its data will be backed up to the cloud by default, using the Android™ backup functionality. If this feature happens to be active on your device, the data will be in Google’s or your device manufacturer’s responsibility. Those backups are not encrypted by Cards Ready. If you don’t trust the storage provider for your phone’s backup functionality, you should turn off that feature. (Then again, you might as well turn off the whole phone.)