You can set your 'Unsold' folder to show the last 60 days. That's it, eBay don't hold them any longer than that.

If you use Turbolister, they stay there for yonks. Not sure how long, but it's considerably more than 60 days.

I save the text of my listings in Notepad and the pics on my computer; that way I can recreate a listing in about a minute.