Hello,
i will minting in Peercoin but i need to keep the application up or I can close the application for the staking?
(Sorry for my English)
It needs to be up and “unlocked for minting only”. A synced client should not take up many resources.
Mmm…
Okay I will use my Raspberry Pi for this ^^
But there a version GUI of peerunity?
why not try peerbox? it is designed to securely mint peercoins on your raspberry pi
/shameless plug
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Okay… with peerbox, we must download the Blockchain?
yes
you can even get 20 PPC with it if you run a full node 
https://talk.peercoin.net/t/peercoin-on-raspberry-pi-get-20-ppc-for-setting-up-a-node/
Okay, but I already download the blockchain, there is a .conf file? for -dbcache=xxxx
yes in ~/.ppcoin/ppcoin.conf