Our driveway is really steep and the few times I've backed up it (for unloading things), I couldn't see a thing behind me. Since dh and I always park in the garage, it'd be much more dangerous for us to back in than to back out, especially since our kids are more likely to use the garage-to-laundry-room door than the front door when they've heard the garage door open.
At my dd's old day care center, I'd always back in, though. It was a small parking lot with just one row of parking spots that jutted up against a wall, so once you drove by it to back in, you knew no one was in it and it was unlikely someone would walk through it. Backing out was worse because of all the kids.
Depending on the parking lot or driveway, either way might be safer. One tip I read once said to always tap your horn before backing up, so anyone nearby that you might not see will hear and be aware. I thought it was a good tip, although I haven't been doing it.
At my dd's old day care center, I'd always back in, though. It was a small parking lot with just one row of parking spots that jutted up against a wall, so once you drove by it to back in, you knew no one was in it and it was unlikely someone would walk through it. Backing out was worse because of all the kids.
Depending on the parking lot or driveway, either way might be safer. One tip I read once said to always tap your horn before backing up, so anyone nearby that you might not see will hear and be aware. I thought it was a good tip, although I haven't been doing it.