Silver certificates were backed by specific dollar amounts of silver. That is, a $1 silver certificate was backed by $1 worth of silver in the Treasury, a $5 certificate was backed by $5 worth of silver, etc.

The government maintained a fixed price for silver bullion so the bills were indirectly backed by a specific weight. However the fixed price wasn't $1/troy ounce but $1.29, so the weight was roughly 0.77 troy ounces, or about 24 gm.

They went to war with Serbia, which was backed by Russia, which was backed by France ... and Britain.

the lady who backed into you, clearly she wasnt paying attention and backed into your car

sadly it is backed only by promises. It used to be backed by gold but that was taken away and now it is backed by nothing.

Whomever backed into it is at fault.