I've been looking for this story for a number of years and it's driving me mad. I'm not sure if it's something I read, or something I wrote as a teen for a creative writing project in school. I must have read it in early 2000s but is likely from mid to late-90s. It would have been in a book of similar short stories, either horror or sci-fi. I am in the UK.
From what I can remember it is called 'Save Point' and it's about a man who has a wife and child and his life is going well, so he signs up to a company that lets him create a "save point". If he ever wants to restart his life again from this save point, he just has to ask the company to roll his life back.
So there's a car crash and I think his wife dies (possibly). So he goes to the company and asks to be put back to the save point. They do it, but the file is corrupted so things aren't right. His wife is an alcoholic and their kid has issues too.
I can't remember how it ends, but I think he attempts to go back to the save point numerous times and things get messier and messier.