Xapo is a web-based wallet system, so alls you need to access it is a web browser and Internet connection. Xapo is known for having reasonably advanced privacy and security features, especially for a web-based wallet. The company supports payments through a debit card system, making it easy to spend your Bitcoins. The app is also friendly for newbies, so if youre new to Bitcoin, give Xapo a close look.
It does not matter how advance your defense system is there are always ways to get around it, there are hacks to exchanges every once in a while, so an online wallet cannot be considered to be very safe.
If you have many amounts of bitcoin I suggest to buy hardware wallet like TREZOR or KeepKey if you want to secure and safe your bitcoin.