Are recumbents good for your back? I am in my late 40s and yes I have a sore lower back. Most likely from too many bicycle rides on incorrectly sized / fitted bicycles.
I am thinking of getting a recumbent for my daily commute to work. Are they generally good for your back, or is it worse as you're bending your neck forward more to see ahead?
I've never ridden one.
Thanks
Yes, recumbents are good for your back, and backside.  They provide support for the length of your back, which may be as little as a tailbone paddle, or right up to your shoulders.

The longer seats generally have the option of incorporating a headrest/neckrest too.  Getting the angle of seat and neck right is significantly important in your comfort.  Getting the length of the seat back right for your spine is critical for comfort.

Storage at work becomes a problem too - depending on your workplace, it might not fit in any bike racks or sheds.   My bike storage is on the first floor (the second floor) so all riders carry their bikes up a flight of steps.  Can't imaging a recumbent making it up the stairs.  Update: I carry it up the stairwell fine.  Have to be careful going around the corners, and opening doors is a bit of a balancing act, but it works fine.

So if you end up parking it outside, there is the risk of theft and damage.

I've tried one SWB 2-wheel recumbent, and it was horrible to start with.  Took a good 30 minutes to acclimatise to the seat and the steering, and having to balance differently to a DF bike.  Getting started was a mission, so I started trying to time the lights rather than stopping for reds.

If you don't know what you want, you really need to try both a trike (either a delta or a tadpole) and a 2 wheel design.

The differences between "normal" steering, tiller steering, under-seat steering and steering wheels also need to be experienced to see which one you like the most.

Try and find a local HPV (Human Powered Vehicle) group and pop along to any event.  Recumbent riders are often happy to talk, and might give you a test ride.   Don't jut buy one sight-unseen, there are too many variables.

Finally, you probably want something with rear suspension and a padded or string seat.  There is no way for a recumbent to unweight the bike, so you will go hard into any lump or pothole that your tyres find.   This would be bad news on a sore back. This is totally true - its hard enough on chipseal, but any kind of broken ground would be a nightmare.  That said I'm using 1.25" 26" commuting tyres at 60 PSI.  Big Gooshy balloon tyres would be beneficial.