I was reading https://bitcoin.org/en/secure-your-wallet
I don t understand the following quote :
Backup your entire wallet
Some wallets use many hidden private keys internally. If you only have a backup of the private keys for your visible Bitcoin addresses, you might not be able to recover a great part of your funds with your backup.
Do they mean too say to that you need your backup more then the .dat file .
I thought that i was 100 % secure if i used the backup function(assuming i backup correctly and have a 12 digit password)
I assume the process in Litecoin is similar?