It is interesting to read about everyone's labeling/note taking procedure. Here's what I do:
I label my carboys with just the batch name. I take some notes on paper, but then transfer them to a Word doc. When starting a batch, I print out a page with the recipe and tables for iniitial measurements/adjustments and SNA. Then once it is started, I enter my notes into the computer. When I am working on things I bring my laptop into the wine room so that I can look all the notes on my current batches and any previous batches (e.g."What was the OG of my previous batch of peach wine?"). My notes are in Google docs, so I can access them from my main computer or my laptop. The information that I want to have available is far too much to have on any label, so I don't try to write it there.
For anyone interested, my batch note sections are:
* Overview with dates for key steps such as yeast pitch, racking, and bottling
* Recipe
* Initial SG/pH readings and any adjustments (table)
* Nutrient/SNA schedule calculated for this batch (table)
* Finishing notes for whatever I measure/add at bottling (Kmeta, stabilizing/backsweeting, gycerin, etc.)
* Detailed notes with dates for every step and measurement, including tasting notes both before and after bottling.
* Next steps for anything I want to be sure to remember later on (e.g. "check pH before bottling"). These are temporary notes that I delete when no longer needed.
* Notes for next time: anything I want to consider doing differently the next time I make a similar wine/mead/cider.
After a few years, this becomes a treasure trove of information. For example, if I detect H2S at the first racking, I want to know: Did I have this issue with previous batches using the same fruit and/or yeast? If so, what was the nutrient schedule of the two batches? Etc.
I have also found it helpful once in a while to print a 1-2 page document with a list of batches currently in bulk aging with a few notes about next steps. (e.g "Rack around 6/1/23," or "check pH at next racking," or "Consider adding glycerin at bottleing.") I can reference that quickly to see what each batch needs next.
I started playing around with writing a WordPress plugin to track my batch notes, but life is busy so I haven't had time to work on that. Maybe someday I will get a chance to finish it!
Use whatever system helps you to keep good notes about what you do. Good notes are important to help us improve our craft.