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Strategies for saving and investing in multiple foreign currencies
The bad news is that foreign exchange is ultimately somewhat unpredictable, and analyzing the risk of these things is not particularly straightforward. I'm afraid I don't know what tools exist to analyze these, aside from suggesting you look at textbooks for financial analysis classes. The good news is that there are other people who deal with multiple currencies (international businesses, for instance) who worry about the same thing. As such, you can take a look at foreign exchange rate futures and related instruments to estimate what the market as a whole currently expects the values to do. The prices of these futures could be a useful starting point.