Backup from inside a guest OS assumes backing up and recovering virtual machines similarly to physical machines. This functionality becomes available by using Acronis Backup & Recovery 11 Agent for Windows or Acronis Backup & Recovery 11 Agent for Linux.
Agents
For online backup and recovery, install Agent for Windows or Agent for Linux in the corresponding guest system. You can use bootable media to do off-line ("cold") backups and "bare metal" recovery to an empty virtual machine. Installing the software, backing up, and recovery are the same as with a physical machine.
Functionality
Backup from inside the guest OS includes all the Acronis Backup & Recovery 11 functionality available for physical machines. In particular, conversion to a virtual machine.
Conversion to a virtual machine
Wherever Agent for Windows is installed, it can convert a disk-level backup to a virtual machine of any of the following types: VMware Workstation, Microsoft Virtual PC, Parallels Workstation or Citrix XenServer Open Virtual Appliance (OVA). The virtual machine files will be saved to the destination you specify.