Best way to modify a variable with out storage

Hello,

I need to set some variables. Those variables are positions of motors that I use in my project. I want to set those variables because I want to continue work if device restarts somehow.

I'm setting the devices position after each step. When stepping job done, I use save() function to save current position.

But this way causes some conflicts, I think it doesn't only change value and save it. It appends some code after my pure code, then saves it.

Are there a better way to set variables without using an external storage device?