We strongly recommend you have some physical gold bullion. If everything goes to the wall, paper money will be useless. So will Funds, shares, ETFs or any other paper obligation.
Only physical gold, stored safely in a vault, is yours forever. We recommend buying it here and storing it in their Swiss vaults. An alternative would be to store in the UK Vaults, but definitely avoid the US. The US government has a history of confiscating assets in times of need. If you buy from BullionVault they also give you a free ounce with your account opening.