Theres a number of reasons why cryptocurrencies are so inherently popular. They are safe, anonymous and utterly decentralized. Unlike conventional currency, they are not controlled or regulated by some singular authority, their flow is determined entirely by market demand. For me, it is better to save especially bitcoin because it the near future it will boom and bullish!
Of course bitcoin is the nearest possible currency that will change the current routine that we are doing in the traditional currency, Bitcoin will become the new type of money in the future as soon as the countries will accept bitcoin and make it as a legal currency in their country. We should save bitcoin and other possible coins that will become bullish or their price will become very expensive so we can have the advantage in the value of our money.