This is convenient, you can set up any one of your used PC as the Cloud PC, as long as the system is Windows 7 or 8. Such Acer apps let mobile devices reading the contents stored by PC through the wireless network.
So the music files loaded by this app are from the Cloud PC, and the Cloud PC is equivalent to a storage space storing your files such as music, video, photo, etc.
I found a website that taught us to assign a Cloud PC:
Acer is proud to announce the promotion of Philetus to the ACE team. Philetus has been a member since March 2013 and has shown the skills and patience required to be a member of this exclusive, invite only team of experts. Congratulations Philetus!