It's really difficult to know when to start bringing in the backstory for characters. It's very frowned upon to give big chunks of backstory too soon and all the writing books out there say to introduce it gradually. My question is when is it too soon to start bringing it in? I wrote a story recently where I introduced a couple of sentences in the first paragraph which I thought helped create a bit of intrigue and interest, but I was critiqued for it in my writing group. What do other people think about backstory? Is the first paragraph too soon or does it depend on how it's done?