Considering this uncertainty, you need to plan your investments in a way that you are willing to lose the assets you are investing.
The backup fund can be considered an integral part of your investment. Without a backup fund, holding investments in the long term becomes a difficult challenge, especially without an emergency fund. Therefore, it's essential to have a reliable income source, or you could consider having an alternative income source.
I believe, Risk tolerance and Acceptance of the probability of the market is very a important factor any investor should take into consideration before investing. Hence, a limit if needed is necessary for a healthy growth of the investment.
Emergency funds are necessary, it doesn't matter wether you have a reliable source of income or not. Every investor, Bitcoiner ought to have an emergency funds.
There is no guarantee in the Bitcoin Market, as it is out of our control, power and will. The emergency funds can be a step up during hard times in the Market, Life matters, which affects an investor finances. Provision as this help keep investors in line, free from debt, thus safeguarding Assets during emergencies were the allocation of resources of an Investor is compromised.
Backup funds is same as an emergency funds.