I stumbled on to a bug that makes all of your belongings completely safe. I am playing on day 21 right now with only Marko the scavenger; I go out scavenging every night and have never lost an item to a raid (even though I am raided almost every night). All you do is leave any searchable spot open in your house (never 'grab all', always leave at least one item in the pile/cupboard/cabinet) and before you go to night time, simply deposit EVERYTHING you own except what you are taking with you to scavenge for the night. When you do this, your 'household inventory' is considered completely empty even though all of your stuff is still safe in the house. The next morning you return with an inventory full of new loot, find the house has been raided, and then casually go to your pile and proceed to take everything you need to work on the house for the day. This bug makes one of the essential challenges of the game (security for your base) a total non-issue. I can stock pile as much of everything as I want and never have to reinforce my base. I will mention that constantly being raided and "having everything stolen" does make Marko sad from time to time, but he's sad with over 2 weeks worth of food, a fully upgraded base, and medicine/bandages galore.
Obviously this is a voluntary bug, if you don't want to use it then just don't. I just figured that this was overlooked and not intentionally left in the game.