It's always great to have some money on the side just in case. Even though the interest rates are at an all time low. If there's an opportunity you should try to invest in real estate, since that's one of the most reliable investment markets. I wouldn't invest more than 1/3 of your capital into a digital currency, simply because anything can happen. It can go extremely big or you'll just end up losing your money. Bitcoin is extremely interesting but you need a backup.