Site hacked made child theme, is it safe to save for backup?

My site was already hackeredized.

I have a child astra theme I’d like to not try to figure out how to edit again.

I’m thinking about backing the child theme up on my pc for when I purge and rebuild my website.

but does this carry a risk of bringing hack stuff to my new website build? this time I’ll be smart enough to back up my site on a regular basis. please, and thank you kind helpful community.