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    • Saving files
      • Structure vs. content
      • Saving files in ID folders
      • Saving files in subfolders
      • Sorting by year-month

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    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.

    ╔═══════════════╦═══════════════╗
    ā•‘   Structure   ā•‘    Content    ā•‘
    ╠═══════════════╬═══════════════╣
    ā•‘    ā”Œā”€ā”€ā”€ā”€ā”€ā”€ā”   ā•‘   ā”Œā”€ā”€ā”€ā”€ā”      ā•‘
    ā•‘    │ Area │   ā•‘   │ ID │      ā•‘
    ā•‘    ā””ā”€ā”€ā”€ā”¬ā”€ā”€ā”˜   ā•‘   ā””ā”€ā”¬ā”€ā”€ā”˜      ā•‘
    ā•‘        │      ā•‘     │         ā•‘
    ā•‘        ┓           ─┓─        ā•‘
    ā•‘        1 5    .    5 2        ā•‘
    ā•‘        ─┬─                    ā•‘
    ā•‘         │     ā•‘               ā•‘
    ā•‘  ā”Œā”€ā”€ā”€ā”€ā”€ā”€ā”“ā”€ā”€ā”€ā” ā•‘               ā•‘
    ā•‘  │ Category │ ā•‘               ā•‘
    ā•‘  ā””ā”€ā”€ā”€ā”€ā”€ā”€ā”€ā”€ā”€ā”€ā”˜ ā•‘               ā•‘
    ā•šā•ā•ā•ā•ā•ā•ā•ā•ā•ā•ā•ā•ā•ā•ā•ā•©ā•ā•ā•ā•ā•ā•ā•ā•ā•ā•ā•ā•ā•ā•ā•ā•
    Figure 62.16A. Before the decimal is structure, after the decimal is content.

    So if we wanted to find folder 15.52 in our filesystem, we can see that:

    • It's in area 10-19 because it begins with 1.

    • 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 – 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
    │     āŒ Don't save files here
    └──── 11 Me & other living things
          │  āŒ Don't save files here
          └──── 11.11 Birth certificate & proof of name
                      āœ… Save files here
    Figure 62.16B. Files are saved in IDs, never in areas or categories.

    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
    ā”œā”€ā”€ā”€ā”€ 10 Planning/
    ā”œā”€ā”€ā”€ā”€ 20 Travel documents & visas/
    ā”œā”€ā”€ā”€ā”€ 30 Transport/
    ā”œā”€ā”€ā”€ā”€ 40 Accommodation/
    ā”œā”€ā”€ā”€ā”€ 50 Itineraries & schedules/
    └──── 60 Expenses to claim/
    Figure 62.16C. One level of neatly-labeled subfolders in our Japan trip.

    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
    ā”œā”€ā”€ā”€ā”€ 2016-10-10 Weekend in Darwin/
    ā”œā”€ā”€ā”€ā”€ 2017-03-01 Drive to the coast/
    ā”œā”€ā”€ā”€ā”€ 2018-02-09 Boat to Tasmania/
    ā”œā”€ā”€ā”€ā”€ 2019-06-13 Drive to Bourke/
    ā”œā”€ā”€ā”€ā”€ 2021-01-01 NYE trip to Googong/
    ā”œā”€ā”€ā”€ā”€ 2023-02-11 Bus trip for birthday/
    ā”œā”€ā”€ā”€ā”€ 2023-09-30 Train to Adelaide/
    ā”œā”€ā”€ā”€ā”€ 2024-02-13 CBR-SYD Weekend in Sydney/
    ā”œā”€ā”€ā”€ā”€ 2024-05-27 Train to Griffith/
    ā”œā”€ā”€ā”€ā”€ 2024-06-18 CBR-LRE Qantas museum/
    ā”œā”€ā”€ā”€ā”€ 2025-04-09 Drive to Narrandera/
    └──── 2026-01-07 Hotel in Cobar/
    Figure 62.16D. Every subfolder sorts neatly by date when you start with year-month.

    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
    ā”œā”€ā”€ā”€ā”€ 01-01-2021 NYE trip to Googong/
    ā”œā”€ā”€ā”€ā”€ 01-03-2017 Drive to the coast/
    ā”œā”€ā”€ā”€ā”€ 07-01-2026 Hotel in Cobar/
    ā”œā”€ā”€ā”€ā”€ 09-02-2018 Boat to Tasmania/
    ā”œā”€ā”€ā”€ā”€ 09-04-2025 Drive to Narrandera/
    ā”œā”€ā”€ā”€ā”€ 10-10-2016 Weekend in Darwin/
    ā”œā”€ā”€ā”€ā”€ 11-02-2023 Bus trip for birthday/
    ā”œā”€ā”€ā”€ā”€ 13-02-2024 CBR-SYD Weekend in Sydney/
    ā”œā”€ā”€ā”€ā”€ 13-06-2019 Drive to Bourke/
    ā”œā”€ā”€ā”€ā”€ 18-06-2024 CBR-LRE Qantas museum/
    ā”œā”€ā”€ā”€ā”€ 27-05-2024 Train to Griffith/
    └──── 30-09-2023 Train to Adelaide/
    Figure 62.16E. Oh no!

    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.

    Footnotes

    1. This is a standard template we're using for any longer work trip. I recommend making templates where relevant. Don't reinvent the wheel every time you do a similar task. ↩

    2. We've used the UK date format, but the US format would still deliver chaos! ↩


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