You will still be able to backup your cards/contact data on your iPhone or Android phone.
For iOS devices:
If you are using an iOS device (iPhone or iPad), and have enabled ‘Sync with iCloud’, you will be able to create a backup of your cards/contacts within your iCloud account which can be accessed through any other iOS device using the same iCloud account.
For Android devices:
In order to create a backup on your Android devices, you need to sync your device with Google Drive, after which, if you uninstall the app and/or want to use the same contact list on another device/ScanBizCards app, you may do so by using same Google account on that device.