They always run to deposit ore after 5 pieces gathered. But I want them to run when backpacks full

I saw in the KI section, you can make them either drop items if overloaded or bring it to a storage, given you built some.

Ive built storage. but sadly they dont fill it

did you build the correct storage?

and there is no real way to make them fill the backpack up fully. except manually.
that ability was removed from the game some time ago because of issues it caused with hauling.

the infamous "drool mode"? ;)

If you're wanting them to go with full backpacks for strength training, it might be better to set somebody as a "hauler" between ore and other storage units with a distance to run (wells can be quite good for this). This may no longer work as it used to (see HaTsUnE_NeKo's reply to you above) though i seem to remember it working fine this way a couple of months back.

not realy
more akin to the backpack filling up and all work stops as they have no room for other supplies.
It was frustrating to deal with., as you could empty the inventory then they would promptly refill the entire thing again.
causing major headaches and micromanaging.

so "drool mode" then (this was the first time I saw the term in relation to the game).