The backup tapes were overwritten. The IRS is so strapped for money, they couldnt afford to buy new tape and had to reuse the old ones.
Strapped for money? Really?
“IRS spent $4.4 billion on IT over past five years”
“When Democrats on the House Ways and Means Committee havent busied themselves with obsequious apologies to IRS Commissioner John Koskinen for the Republicans holding his agency accountable for abuse of power, they and other defenders of the IRS complained that the real lesson of the epidemic of hard-drive failures and data losses is that the IRS really needs more money. According to government records, though, the IRS has spent more than $4 billion on information technology over the last five years: “
http://hotair.com/archives/2014/06/27/irs-spent-4-4-billion-on-it-over-past-five-years/
Did I really need a /sarc tag?
Yeah, but how much did they spend on actual hardware ?