putting money aside, savings, deposit (e.g. in a bank)...

savings

to store, to save up, to stock up on...

postal (post-office) savings (deposit)

storage, preservation

storage of water

store, reserve, stock...

deposits and savings, bank account

reservoir

(Japanese) Postal Savings Bureau

storehouse, bunker, silo

JP Bank (former Postal Savings Bank, created when the Postal Services were privatized)

to save up (money)

storing coal, stored coal

stock of lumber, having lumber in store

to be saved up (of money)

accumulation (e.g. of water), retention, storage...

(food) hoarding

storage of hot water, hot water storage

to save up, to stockpile, to stash away...

savings box, moneybox, piggy bank

lumberyard

coal yard

storage place

supplies, stock, stored goods

storeroom, stockroom

water tank

volume of water kept in store

bank book

reservoir, water-storage facility