With dishnetwork you have to rent a box anyway and there DVR is about $3 more a month and if it dies they send you a 'new' one free. Plus DVRs do die, there just a HHD and they just do crash. I have been through 6 DVR's in 8-9 years, Dishnetwork ST DVR boxs are not made very good, there HDDVR's have been much more reliable and just have replaced 1 in 3 years. But with all that trouble it cost zero to replace them.
Better to put the money into a DVD/RW player to backup your favs and rent the boxs.