Enable the shared clipboard in VirtualBox

With Guest Additions installed, the clipboard of your guest OS can be shared with your host OS.

Install Guest Additions

For Arch Linux you simply type

pacman -S virtualbox-guest-utils

Highlight the Guest VBox in the VirtualBox console, open General -> Advanced. Here you can choose between various Shared Clipboard settings: Disabled, Guest to Host, Host to Guest or Bidirectional.

Source: SuperUser.com - How do I enable the shared clipboard in VirtualBox?