I'll start with my own personal method.
Being a tech guy, I like to store tremendous amounts of information electronically. I’ve downloaded hundreds of PDF’s, spreadsheets, databases and other items to help me on the way to living a better life.
Knowledge is king, and I believe in learning as much as possible, but there is just too much info to keep it all in memory, particularly if you don’t have the time to practice all the skills available. Having a good reference library is an excellent way to keep information at your fingertips. However, not everyone has the storage space for a large built in library and its not practical to carry too many books with you in a bug out situation. So below is my current solution. (I sent this to Jack for comments and suggestions so if the info gets repeated thats my fault

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Currently I keep most of them on my phone on a 8 gig MicroSD card. (Along with backups on several machines and CD/DVD’s). They are accessible any time I need them and its pretty easy to find what I need. Short term this isn’t a bad solution. Also in small SHTF situations its fine also. But of course if the phone is damaged (The card is waterproof and can be transferred to any of a number of other devices I have and I have a spare full sized SD card and a couple of the Corsair Survivor USB Sticks) but extended power outages make this a non option. I do also have several secondary chargers and a couple of old laptop frames that I keep batteries charged in. I can recharge the phone 15 or 20 times off of these (and the phone (with transmitters shut off) will last 4 hours per charge of continuous use and 3 to 4 days of periodic use just reading PDF’s).
My other solution is a bootable USB memory stick. This Linux (Puppy Distro) runs off the USB Stick and is capable of booting darn near every computer I've tested it with. This stick contains a copy of all my prepper documentation, instruction manuals, PDF's, spreadsheets and databases. My goal is to have an ultra portable laptop (I have a Dell XT with battery slice that runs for 10 hours on a charge) and have this available, as well as a cheapo used laptop stored at a future BOL. I have a solar power adapter on my short list of needed gear that will keep this happy little combo running for as long as I need it.
Another benefit, since the hard drive is the most likely point of failure on most computers, this will still work even without a hard drive.
I'll post a link to the walk through on this project as soon as I find it again.