Systems and methods for backup of data in redundant data storage systems. In this regard, one embodiment can be broadly summarized by a representative system that copies a block of data from a primary storage unit to a primary backup storage unit using a primary addressing sequence that begins with a first start address; and substantially concurrently copies a second block of data from a secondary storage unit to a secondary backup storage unit using a secondary addressing sequence that begins with a second start address. Another embodiment can be described as a method wherein the first start address is the same as the second finish address; the primary addressing sequence uses an incrementing count, and the secondary addressing sequence uses a decrementing count. Other systems and methods are also provided.