Salvador belonged to the Portuguese Sephardic Jewish synagogue in London, and was a leader in the affairs of this Portuguese-speaking community.
[3] Salvador was a pro-Hanovarian freemason belonging to the Premier Grand Lodge of England and was engaged in anti-Jacobite activities.
The Salvador and the DaCosta family bought hundreds of thousands of acres in Ninety-Six District in the colony of South Carolina in the 1730s.
He was eventually financially ruined after the great earthquake that destroyed Lisbon in 1755, as he had invested considerably in property in that city.
Joseph's nephew was Francis Salvador, who emigrated to South Carolina in 1773, buying 7,000 acres in Ninety-Six District.