Hi:
SyncBack Free is a Windows program. I use it as local application on my server, the same Windows 7 PC where MC resides. I do not use a Pi component. My audio files reside on a local (not NAS) 4TB HD (the D: drive in the attached image), which is accessible on my home network. All of my HDs are local Western Digital RED 5400RPM drives, which are whisper-quiet. I use a docking station to mount the same type of drives for backup purposes. After backup, these devices can be easily removed and taken off site for secure storage purposes.
Regarding Acronis, I am unfamiliar with this application. I use SyncBack because of the incremental options it provides. I am able to choose in a selective manner, files, folders, and sub-folders. Also, the 'type' of backup was of great importance. I can choose the following options: 'Backup', 'Mirror' or 'Synchronize'. I also can choose selective deleting based on the 'From' or "To' side. The bottom line is that this product gives me all the flexibility I require. I use it for all of my backup needs as you can see in the images below. If Windows backup or Acronis provides these capabilities, then the answer to your question is yes, you should be able to use them for your backup purposes. If not, once again, SyncBack is free.
Regarding my audio listening approach, I use a Linn Akurate DSM, a DAC, to receive the audio files from MC via the network. MC manages the Linn Akurate DSM as a zone. After network settings within MC were chosen, the process became quite transparent. It only takes minimal navigation (pull-down menu, Player > Zone or the toggle keystroke combination Ctrl-T) to switch zones from Server (local PC) to Linn Akurate DSM (remote audio system). I wanted simple. This approach helped me to achieve my goal.
Cheers,
Lawrence