If you realize that we live in an ever changing and dangerous world where anything could happen at any time then you have probably also realized that you should have a plan to provide resources you need if the supply system is ever cut off. This mindset takes you into the realm of prepping.
The amount of preparations you have is relative to the type and extent of the event you are planning for. The problem is that we never know just how bad an event will be until it happens. Many intelligent people have supplies laid in just in case they need them but what will you do when they run out? We hope any event will be short in duration but what happens if it lasts for decades?
You may have a small farm to rely on but even if it is designed to be largely self sufficient, you will still run into problems later on. For instance, if you have a solar or wind system for power generation, what will you do when the batteries finally fail to work? Even the best lead acid battery will begin to fail after 10 years of use. What will you do then? There are other types of batteries but they all will fail at some point. Some batteries can last many decades such as nickel-iron batteries if you can replace the electrolyte every decade but that would require you to look ahead and store extra chemicals for that job.
If you farm and you need to buy fertilizer, seeds and fuel every year, what will you do when those supplies are cut off? There are ways around those problems such as using manure from your livestock to fertilize fields, using bio-diesel or wood gas for fuel and cultivating open pollinated seeds for future use. All of these solutions require prior planning to utilize them if it is necessary. And for machinery, keep in mind that you may be able to make fuel but lubricating oil and filters are a different matter that will require storage of extra supplies that you cannot make yourself.
Growing and canning your own foods is a smart move but do you have the supplies to do it indefinitely? If you use disposable canning lids how long will your supply last? If you use reusable canning lids and store extra rubber gaskets you will be able to can for many decades.
Following any large event that shuts down the grid or distribution system for several months or more, the supplies you need will not suddenly reappear on store shelves immediately following power restoration, transportation and banking. Many factories will have ceased operation during the event and may never reopen. The production and distribution system is a hardy weed but it will not reappear overnight once it has been shut down and you need to understand that and prepare accordingly.
Most people have a planning horizon of only a week or month at best. Preppers extend that to several months or a few years. If you really think we are headed for some type of catastrophic event then your planning horizon needs to be 5, 10 even 20 years out to foresee any problems you may have and plan your logistics to compensate for it.
Planning for the unknown 20 years out is a big step and the cost of some of the projected logistics could be enormous but simply looking at the problems now and coming up with cost effective solutions can have enormous benefits in the future.
Having a few basic tools and the knowledge to make leather shoes or boots can guarantee you a supply of footwear in the future. Having a sewing machine, spinning wheel, loom and some cotton seeds can provide you with the ability to make clothing indefinitely. A small charcoal foundry will allow you to make many types of metal products.
While we may not want to resort to these primitive types of production, it may be your only option if the worst happens. Simply having the materials and knowledge to resort to these types of production can be inexpensive today but priceless tomorrow if they are ever needed.
Looking ahead today and planning for tomorrow will allow you to deal with anything life throws at you in the future. The more resourceful you can become now, the more likely you will have a good quality of life in the future. It all starts with planning.