Short-term: hold the freshness
Short-term storage for dark tea is a narrower case than people expect, but it is real. Ripe pu-erh in particular is often bought with a specific short-term goal: letting the wet-pile smell from production fade.
That takes one to three years in a clean, moderately humid environment, and it is a subtractive change rather than a transformation. The tea gets cleaner and rounder, not different.
For fu brick and Liubao the same applies. A year or two of settling takes the rough edge off a young pressing and makes it considerably more pleasant to drink.
So short-term storage here is not about preserving anything. It is about finishing what the factory started, and it is a genuine reason to buy a cake you intend to drink soon.
Long-term: change the goal
Long-term storage is what dark tea is for, and it is the only category where this is true. Raw pu-erh in particular can be harsh and aggressively bitter when young, and a decade or more is what turns it into what most people want to drink.
The environment is stable room temperature, roughly 20 to 30 degrees, with humidity around 60 to 70 percent for raw pu-erh and a little drier for ripe. Paper wrapper, cardboard box, and a cabinet that smells of nothing.
The timeline is measured in decades, not years. Five years produces a noticeable softening. Ten produces a genuinely different tea. Twenty is where the reputation comes from, and where the fakes are most common.
The variable that decides whether any of this happens is humidity. Below about 50 percent, transformation nearly stops, and a cake can sit for ten years and barely move. Above 75, you are risking mould.
Temperature matters far less, and this is where a lot of advice goes wrong. A cake kept at a steady 20 degrees will do fine. The humidity number is the one worth checking.
Which is your case
Which case you are in depends on what you bought and what you want from it. A ripe pu-erh bought to drink in the next two years is a short-term purchase, and it only needs a clean cupboard.
A raw pu-erh bought young and harsh is a long-term purchase by definition, because it is not pleasant yet. You are buying potential, and storage is what converts it.
Your climate decides whether that conversion is realistic. In a dry flat below 45 percent for most of the year, a raw cake will keep well but change very slowly, and you should plan on double the usual timeline.
And your willingness to leave it alone decides the rest. Long-term storage only works on cakes you are prepared to forget about for years at a time.
There is a financial version of this question too. Long-term storage ties up money for a decade in tea you cannot drink yet. If that bothers you, buy ripe pu-erh, which is ready now, rather than raw.
And a warning about the top end. Cakes sold as twenty or thirty years old are common, and genuinely well-stored cakes of that age are rare and expensive. Most of what is on offer is either younger than claimed or stored badly.
If you want aged dark tea and cannot verify provenance, the safer buy is a five to ten year old cake from a dealer who will stand behind it, not a bargain cake with a dramatic age claim.
A quick decision rule
The rule: if the tea is drinkable and pleasant now, treat it as short-term and drink it over a few years. If it is harsh or young, commit to long-term storage and set up the environment properly.
Get a hygrometer. For dark tea this is not optional, because the gap between a cake that develops and one that moulds is about ten percentage points of humidity.
Buy from somewhere that can tell you what the tea is and when it was pressed. Age claims without provenance are decoration, and fake aged cakes are common.
Then leave it alone. Check twice a year, press the cake, smell it, and close the box. The best dark tea storage is mostly a matter of not interfering.
Short version: drink ripe pu-erh soon, lay down raw pu-erh for years, and never seal either in plastic.