[Q] Trying to get a proper android backup topic

Migrated to android about a year ago and still haven't been able to work out proper android backup.
I want to be able to mess with the system without fear of losing my data/configurations.

For example when installing Lollipop I encountered a lot of problems and every time I ****ed something up and had to reflash it I need to reinstall and reconfigure ABSOLUTELY EVERYTHING (Including redownloading about 13GB of music for google play music).

This has been a major letdown as I love tweaking and messing with the system getting it 100% the way I like it.
I've been able to get a basic functioning Lollipop installation but I want more.

Here's what I want to be able to backup to my PC (a 13GB backup on the device isn't very practical, especially when messing with the system):
My apps and all their settings (Including google play's downloaded music).
System settings.
This way and I can mess with the system and once I get it the way I want- restore the backup.

I know this might seem like a lazy google question but I am really at a lose.
I've scoured the internet looking for a solution, Tried numerous programs with no success.
Please if someone can guide me in the right direction I'll be forever grateful.