Is there any way for export my bookmarks?
You should be able to do it through some extension.
Isn't it possible to save my bookmarks online? I mean using synchronize option and save my bookmarks in my opera account.
Just enable synchronisation in Opera. But remember that a synchronisation service is not a backup service.
There are other VPN extensions in the opera catalog. Try
VPN.S HTTP Proxy
extensions. You can search for them on addons.opera.com and install them from there. I hope at least one of them works.
Perhaps because the Opera browser has always had an inherent proxy capability (via Turbo and more recently, directly via built-in VPN access) that permit some users to get around local web censorship of website URLs. If the local authorities become aware of the IP addresses of the VPN/proxy servers in use, they will attempt to block access to them as well. It's easier to block VPN/proxy access addresses 'wired into' a browser than VPN/proxy addresses that may be changed more readily, as with external VPNs.