Elcomsoft Phone Breaker (EPB) can be used to download backup files stored on iCloud as well as download Synced data collected by Apple. A full, licensed version of EPB is required to access these backup files. The next few slides walk you through how to access data stored in iCloud. CAUTION: Make sure you have legal authority or consent to use methods such as this for accessing iCloud data. Another tool worth looking into is inflatabledonkey, which can be used to extract iOS backup files from iCloud.2
References:
[1] https://for585.com/donkey (GitHub for inflatabledonkey)
