Saving files
Structure vs. content
Before we start saving things, let's take a quick look at the structure of the Johnny.Decimal system. Just to reinforce why we put things where we do.
The number before the decimal tells us what area and category we're in. It gives our system its structure. The number after the decimal is the ID. This is where we store our content.
âââââââââââââââââŚââââââââââââââââ â Structure â Content â â ââââââââââââââââŹâââââââââââââââ⣠â ââââââââ â ââââââ â â â Area â â â ID â â â âââââŹâââ â âââŹâââ â â â â â â â â´ ââ´â â â 1 5 . 5 2 â â ââŹâ â â â â â â ââââââââ´ââââ â â â â Category â â â â ââââââââââââ â â âââââââââââââââââŠââââââââââââââââ
So if we wanted to find folder 15.52 in our filesystem, we can see that:
-
It's in area
10-19because it begins with1. -
It's in category
15. -
And its item number is
.52.
Saving files in ID folders
We save our stuff in our Johnny.Decimal ID folders. Spreadsheets, documents, scanned receipts, references, emails, images, and whatever else you're organising.
We don't save things in areas or categories
We never save things in area or category folders â these are structural only. They're there to guide us to our content.
If you genuinely can't find an ID that feels right, you might need to spend some time expanding your system to include a new category, or even a new area.
10-19 Life admin
â â Don't save files here
âââââ 11 Me & other living things
â â Don't save files here
âââââ 11.11 Birth certificate & proof of name
â
Save files here Saving files in subfolders
I used to be anti-subfolder but I've folded like a cheap suit. There are plenty of cases where it makes sense to use subfolders.
However
There's no point to any of this if you just go back to putting your stuff in boxes-in-boxes-in-boxes-in-boxes. Stick to one level of subfolders, label them neatly, and don't have too many.
For example, our trip to Japan is quite complex. So we've organised by subfolder.1
15.55 Japan, 2025 âââââ 10 Planning/ âââââ 20 Travel documents & visas/ âââââ 30 Transport/ âââââ 40 Accommodation/ âââââ 50 Itineraries & schedules/ âââââ 60 Expenses to claim/
If we didn't have subfolders there would be files all over the place. They're helping us find our things quickly, confidently, without stress. So it's all good.
Sorting by year-month
Let's take this even further. Whether you're naming subfolders or files, if you use the date correctly it solves so many problems.
For example, the ID 15.41 All short trips from the Life Admin System contains all of our short trips. The sort of thing that you don't really plan, you just book and go.
You can fit a lifetime of short trips in one ID if you create a new subfolder for each trip, and start it with the yyyy-mm-dd date.
15.41 All short trips âââââ 2016-10-10 Weekend in Darwin/ âââââ 2017-03-01 Drive to the coast/ âââââ 2018-02-09 Boat to Tasmania/ âââââ 2019-06-13 Drive to Bourke/ âââââ 2021-01-01 NYE trip to Googong/ âââââ 2023-02-11 Bus trip for birthday/ âââââ 2023-09-30 Train to Adelaide/ âââââ 2024-02-13 CBR-SYD Weekend in Sydney/ âââââ 2024-05-27 Train to Griffith/ âââââ 2024-06-18 CBR-LRE Qantas museum/ âââââ 2025-04-09 Drive to Narrandera/ âââââ 2026-01-07 Hotel in Cobar/
Remember, year-month must come first. If you reverse the above dates, the folder would sort like this and be chaos.2
15.41 All short trips âââââ 01-01-2021 NYE trip to Googong/ âââââ 01-03-2017 Drive to the coast/ âââââ 07-01-2026 Hotel in Cobar/ âââââ 09-02-2018 Boat to Tasmania/ âââââ 09-04-2025 Drive to Narrandera/ âââââ 10-10-2016 Weekend in Darwin/ âââââ 11-02-2023 Bus trip for birthday/ âââââ 13-02-2024 CBR-SYD Weekend in Sydney/ âââââ 13-06-2019 Drive to Bourke/ âââââ 18-06-2024 CBR-LRE Qantas museum/ âââââ 27-05-2024 Train to Griffith/ âââââ 30-09-2023 Train to Adelaide/
This works for so many things
Purchase receipts is another nice example. You can fit a lifetime of receipts in one ID if they all start with the date, then what it is and where you bought it.
Also consider things like utility bills and finance statements. Don't save them with the gibberish names from the utility company or bank. Using the year-month method, you can store hundreds of neatly-sorted, easy-to-find documents.