Can this tree be saved

Strong winds blew this plum tree almost over. Tried to straighten it but would not stay upright. Love to save it if possible.  Thoughts or suggestions?

Is the trunk still firmly attached to the roots?

If yes, steaks.  Giant ones, in a triangle around the dripline of the tree.  Innertubes from bike tires (usually free at any bike repair shop) to tie trunk where branches start (so quite high) to each steak.  Check and adjust the ties every 3 months or it will damage growth.  Fixed in about 2 to 5 years.  

Worth checking the root plate first before you stake it. If the roots on the windward side have snapped clean rather than just lifted, staking might hold the trunk upright but the tree could still decline slowly without enough functioning root mass. Gently dig back on that side and see what you're working with. If most of the major roots are intact and just pulled up some soil with them, stakes and time should sort it. Water well after you've settled it back, the fine root hairs will have dried out a bit.

You can try. I've righted lots of downed trees and nearly every one of them survived. The good news with this one is that it's only leaning and not flat on the ground.

Step one is to reduce the crown. There are a few reasons for doing this. One is to lower the transpiration rate of the tree, since it's under stress from some of its roots being snapped. Another is to limit the amount of profile it presents to the wind and make it less likely to get blown down again. The last main reason is to make it weigh less so that it's easier to winch back upright.

I'd advise cutting back about half the length of all the branches, and maybe doing a bit of thinning so that the canopy is less dense. When that's done, it's just a matter of using a winch, block and tackle, or similar contraption to gently bring it back upright. You might need to prop it for a season while it regrows some anchoring roots. Three stout poles, equidistant from the trunk, can give you a place to tie off some straps with give in them. r ransom cleverly suggested inner tubes.