As far as I read, using TorBrowser with Tails, it's better than using only Tor, because Tails doesn't store any data on the Hard Disk, and because of leaks related to services running in background when using Mac Os, Windows, and so on.
Since anonymity is not priority, If I decided to use a Mac_Os as a host and install VirtualBox to run Tails as a guest, my question is: What are the risks of someone getting access to my document files or get root access?