As you know, raw video is extremely large compared to its encoded cousins. How is the data used during that 2 months and does it need to remain raw?
The obvious answer would seem to be that any codec would greatly reduce the size and loss is minimal with good ones. Much of life as we know it, including streaming on the web, would not exist were it not for codecs.
Is there some barrier to doing that. or why was it not done all along is probably a better question?
If the time needed for re-encoding is excessive, simple 7-zip compression would dramatically reduce the size, as would any other compression scheme.
How long are these files to be kept? Compression rates can be as high as 90%, meaning 20 months instead of 2 without moving anything.