I know many people store all their important info in digital form but I favour old-fashioned pen and paper - have a look at their leatherbound diaries and addressbooks which are also beautifully made, and won't let you down when the wifi is up the spout.
New notebooks from Leathersmith of London: teal embossed leather
New notebooks: classic neutral snakeskin print in taupe (which goes so very well with my new snakeskin shoes) or magenta snakeskin
New notebooks: Rutland grained leather (shown with the snakeskin print notebook)
The new Dataday Jewell Collection - notebooks available in three sizes, covered with linen-effect cotton in seven vibrant colours, one for every day of the week.