The meaning is clearly that your personal settings etc will not be lost/deleted when you update to a newer version. There is no single-word English equivalent and the whole thing would often be paraphrased, but 'upgrade proof' is clear and sounds ok. It is analogous to the more general and much more common 'future proof'. This is definitely what an IT specialist would say if trying to sell this aspect of his code - I know because I'm married to one and I asked him!