I've rendered a gigantic numbers of scenes, which results in around 22TB (yes, the process took several month-computation and resources). Apparently, I cannot use the EXRs out-of-the-box so I have to extract the PNGs from them, which costs additionally 8TB. For storage and backup purpose, I'd like to store and save the EXRs somewhere (you don't really want to throw away a-year-worth effort), but 22TB is a bit too much for me. I am wondering if there's any good way to reduce the size of them, at least to 75% or even better 50%. The EXRs are already made with compression enabled, so even xz level 9 doesn't reduce much space of it (the compression ratio is only about .95)

  • $\begingroup$ Full floats could be saved as half floats and maybe you don't need all of the channels and could remove some of them (e.g. z). $\endgroup$ – Leander Dec 11 '18 at 15:21
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    $\begingroup$ You could look into tape backup. Sounds like a perfect situation for it. It is not like you are going to be accessing it frequently. $\endgroup$ – Martynas Žiemys Dec 11 '18 at 15:41
  • $\begingroup$ @Leander just to make clear, EXRs should contain all information and passes from the rendering (because I happen to need them all) but I've extracted the most uses and necessary out. The question now is if there's an efficiently way to store them as backup or archive purpose $\endgroup$ – AugLe Dec 12 '18 at 14:44
  • $\begingroup$ @MartinZ can you elaborate the answer a little more? Currently I am using tar + xz level 9 but only achieved 95% compression ratio. Maybe it's due to the fact that EXRs are already saved in compressed state. Are you aware of any heavy algorithm that can achieve better that XZ (in exchange for memory usage and speed...) $\endgroup$ – AugLe Dec 12 '18 at 14:46
  • $\begingroup$ Then this question is not really about the usage of Blender? Maybe it is better suited for superuser. $\endgroup$ – Leander Dec 12 '18 at 14:48

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