HELLO

question. Do I need to back up my wallet from time to time and put it into a USB?
and what does save keys do? I don't remember having a private key only a password on the wallet
thanks
This is not a bad idea

It is better to have a backup than an empty wallet. I would still keep the keys in the cloud store.
In principle, every month do not necessarily. The keys do not change. But keep on different disks / flash drives.