hdd partition questions

hello, i have a 1TB HDD on my mac, i've partitioned 500GB each, one is the main, the other is for data backup,
i'm using parallels to run win10, how can i put an icon of my data partition that's on my mac on my virtual windows10,
not a folder shared on the net, a partition icon, so that i can view and modify files from either OS.

What will happen to your backup if the hard drive fails? Never use your internal drive for backing up purposes; that's what an external drive and Time Machine are for. Before you do anything else, re-do the partitions as one and then worry about annotating your Windows 10 virtual machine.