Last I checked there was an option to backup your wallet so you still have the private key, in case BC gets crashed/locked etc. Feel free to prove me wrong though
Yup they provide you an option to backup your wallet.dat
But not all of us do this.And sometimes backing up increases the chances of getting your coins stolen.
If you leave it out in the open and transfer it everywhere, yes. Blockchain.info wallet.aes.json backups are encrypted by the user's password and would take an attacker sometime to bruteforce it. You can keep it out in the open and you won't get it stolen immediately with a strong password.
If you have a wallet on their server, then you might lose it. The network would go on because all of the users with the right type of wallet downloaded would carry on the blockchain. Imagine if every person on Facebook downloaded and served the website to more people. If the facebook server dropped, the site would go on because there servers all over the world.
Running the network won't be a problem.We are concerned about our coins.Do they have the copies of encrypted wallet at every location(of all the user's)?
Yes. They don't have the user's unencrypted copies in the first place.
If you don't have backup for your wallet, then say goodbye for your bitcoin or sue blockchain.info in court and ask them to give back your bitcoin.
But, i'm sure they have encrypted backup for their users wallet.
Maybe they should advice their users to backup their wallet in case blockchain.info is down or gone
Does block chain have any insurance policy?
Has anyone read there T&C?
No. They do not have any obligations to refund customers or claim responsibility for any damage. Just for the record, its's on their TOS:
6. ASSUMPTION OF RISK
Company takes no responsibility for and will not be liable for any losses, damages or claims arising from
the use of our Services, including, but not limited to, any losses, damages or claims arising from (a) wallet
data being "Bruteforced", (b) server failure or data loss, (c) forgotten passwords, (d) corrupted wallet
files, (e) incorrectly constructed transactions or mistyped Bitcoin addresses; or (f) unauthorized access to
mobile applications, (g)"phishing," viruses, third-party attacks or any other unauthorized third-party
activities.
They do have a history of refunding users that were affected in their security incidents however.