Our Android client for mobile data collection, sharing and monitoring now has a significantly improved fail proof background data upload and download. The upload and download streams compressed data in an incremental fashion, allowing for both software and connectivity failures and continues from where it was stopped. All this happens efficiently in the background, meaning that the user can continue doing other work with PoiMapper while downloading or uploading is taking place. No more, does anyone have to worry about whether data actually was correctly delivered nor has to start download request from scratch if something goes wrong. We believe these are extremely valuable features, especially when the amount of data being transferred grows to hundreds of megabytes or even gigabytes.