What are some alternatives?
Dropbox - Online Sync and File Sharing
Scanbot - Scanbot is a mobile app that allows you to use your device's camera as a document scanner. The app is capable of scanning a large number of source materials, and it can handle QR codes as well.
Google Drive - Google Drive is a personal cloud storage service from Google that lets users store and synchronize digital content across computers, laptops and mobile devices, including Android-powered tablet and smartphone devices.
Scanner Pro - Scanner Pro turns your iPhone into portable scanner in your pocket.
Syncthing - Syncthing replaces proprietary sync and cloud services with something open, trustworthy and...
CamScanner - Camscanner turns your phone into a portable scanner.