As for how long data should be kept: distinction to be made been original raw data keyed into the system vs. data generated from source records. (slaw.ca)
Since learning of these potential problems, Sebastiani et al. have been performing a thorough quality - control analysis on the original raw data, as well as generating new data to compare the genotype calls from the 610 - Quad array and the other platforms within the same individuals. (science.sciencemag.org)
The UK Times reports it as saying, «we do not hold the original raw data but only the value - added (quality controlled and homogenised) data.» (pjmedia.com)