Thanks Meter 875
Join Date: Nov 2012
Location: Los Angeles, CA
Sync backups only backup your apps and data. TWRP allows you to selectively create images of your partitions which you can restore (called a nandroid).
Don't know what Harman Kardon is... If it's just an app, you can uninstall it normally. If it is a hack that changed system files, you would have to flash your rom again or restore a nandroid from before you flashed it.