Backup Zcash4win wallet

Hi , i have a question to backup my wallet i have to save just the private key? or how can i secure my coins on a USB stick ?for example

Thx in advance

You just need to save a copy of wallet.dat while the wallet is not running.

OK thx I’ll try later

I’d like some clarification here;

Do I have to update the backups after each transaction?

Or will everything show up if I have to reinstall the wallet and restore the wallet.dat file from a backup?

Does the blockchain keep all that info in place and accessible to me through my private key?

Hi I have a doubt. I alredy copy the wallet.dat file just like you sayd. But my balance still in 0. Do I have to wait until 100% blockchain synchronized to see my balance like before. Sorry for my bad English. Thanks