Quote from: AnonBitCoiner on November 02, 2014, 02:14:17 AM

Quote from: ranochigo on November 01, 2014, 02:41:41 PM

Quote from: patt0 on November 01, 2014, 08:56:08 AM

Quote from: CoTi on October 31, 2014, 05:54:53 AM

Quote from: Mccoy818 on October 30, 2014, 10:40:31 AM

Quote from: karthus on October 30, 2014, 04:32:33 AM

Understand basics like the following:

1. Learn to back up your wallet balance
2. Learn to save your private keys and do not share them
3. Learn bitcoin balance typo errors can be made eg: 0.1 when you meant 0.01
4. Learn bitcoin is a non reversible payment
5. Learn to use reputable escrow with +1 or higher
6. Know in the bitcoin world of business anything can be gone within in instant.

Is backing your btc wallet really necessary?

I suppose, it is unnecessary if I just buy/sell. is it right?

Yes if you want to keep your bitcoins online without having a wallet on your computer, but I don't know if that is very safe.
If the site goes down or is hacked, you could lose control of the bitcoins. : /

Online shared wallet are not 100% secure. The operator have full control of your Bitcoins, try using wallets like blockchain.info and enable 2FA. Since they do not have any control over your Bitcoins, you will not lose them if they get hacked or run away. It is pretty much secure from hacker too compared to normal desktop wallets as they need 2FA code to access your account.

To be honest, nothing would be 100% secure. Whether you keep a paper wallet in a physical location or an online, or a desktop wallet, there will always be insecurities; it's a wallet, like any other wallet. But I agree with the blockchain.info; it is one of the more reliable ones.

The offline paper wallet pretty much eliminates much of the risk, the risk of hacker getting your private key. Risk of bad RNGs can be eliminated by using mouse movement to generate a private key. Encrypting with BIP38 eliminates the risk of a person finding your paper wallet and spending it as they need the password.