Daub was born in York County, Pennsylvania on February 18, 1845. He was the son of Michael and Katherine Daub. He moved with them in 1855 to Lancaster County, Pennsylvania. At the outbreak of the Civil War, Daub enlisted from Lancaster County as a private in Company B of the 45th Pennsylvania Infantry. He fought at the Wilderness, Spotsylvania, and Petersburg. Following the Petersburg mine explosion, he was captured. He was imprisoned at Andersonville for seven months and later at Libby Prison and Danville. Daub was paroled February 22, 1865 at Annapolis, Maryland.
The certificate recognized Daub as a lifetime member because of his imprisonment at Andersonville. The certificate further states that "his Health has been seriously impaired and he contracted General Disability during confinement in Rebel Prisons."
The organization was founded in the wake of the publicity surrounding the trial of Henry Wirz, the commandant of Andersonville. Former prisoners of war formed the organization to lobby Congress for disability pension legislation.
Following the war, Daub moved to Sandusky County and farmed 120 acres in Jackson Township. He married Lydia Shale and the couple had five children. In 1901, he moved to Burgoon, where he sold hardware and implements until fire destroyed his business. Daub was a member of Sandusky County's Eugene Rawson Post of the Grand Army of the Republic. He was also a road supervisor and a member of the Evangelical Church. December 5, 1919, Daub died suddenly of a heart attack.