I've seen them scrape and believe this is normal buck behavior. It's kind of like a cat burying it's poo. It's something it's born to do.

Scrapes and rubs are sign post to deer. They use them to communicate and to tell other deer who's been through an area and to mark territory. By rubbing they are leaving behind forehead gland scent for other deer in the same way they scentmark a scrape. So, to answer your question, Yes they will scrape and mark all year.

If so is it really that big of an importance?
To them yes. They are communicating. (Durring the rut it's a sexual thing)