Hi Jon.
Sorry but I didn't take any pictures of the process last winter. This was this first time I tried it and it was quite successful.
If it helps, I'll take a stab at explaining what I did:
I dug a trench about 2' deep and long enough to accomodate the trees I had. All my trees were pretty small with none being taller than about 4'.
The trees that were in pots, I left in the pots and simply laid them on their side in the trench. In-ground trees I dug up completely (bare-root) and laid in the trench. I then covered everything with soil and mulch and left them until late March/early April (zone 6).
Things I learned and things I'd do differently:
1). I wouldn't dig as deep of a trench because some of the trees that were in the bottom of it ended up with a little water-log rot on a few of the branches. Although the extent of this was minor.
2). Next time I would dig only a shallow swail and cover everything with mulch only and no dirt. The dirt just made it harder to dig everything out. A draw-back here may be that mice would burrow into the mulch and take up residence for the winter. I've heard of this happening.
A possible variation to mulch only would be to use all mulch with a thin layer of dirt over top that. May or may not be enough to discourage the mice.
3). By doing this, nearly all of the wood was preserved and started growing in spring right from the branch tips. With only a couple of exceptions.
4). This also resulted in my having ripe fruit earlier on one variety in particular, that a local farmer had given me. As of this writing, most of the fruit on my trees (of this one type) have all ripened while the fruit on the local farmers trees are all still green and under-developed.
There are obviously some good advantages to using this process but it is alot of work. For those thinking of trying it, it does work.
It's interesting to think that we usually reserve the process of 'burying' for things that are dead. It's certainly a different outcome when it comes to live figs trees :) .
Conversely, I'm planning to cover my in-ground trees with cloth and plastic this winter. I hope this works for me as it will be less work than all that digging and mulching.
I hope you get more input on this Jon as I would like to hear/see the experiences others have had with this.