When Universal Restore is applied to a Linux operating system, it updates a temporary file system known as the initial RAM disk (initrd). This ensures that the operating system can boot on the new hardware.
Universal Restore adds modules for the new hardware (including device drivers) to the initial RAM disk. As a rule, it finds the necessary modules in the in the /lib/modules directory of the operating system you are recovering. If Universal Restore cannot find a module it needs, it records the module’s file name into the log.
Universal Restore may modify the configuration of the GRUB boot loader. This may be required, for example, to ensure the system bootability when the new machine has a different volume layout than the original machine.
Universal Restore never modifies the Linux kernel.
Reverting to the original initial RAM disk
You can revert to the original initial RAM disk if necessary.
The initial RAM disk is stored on the machine in a file. Before updating the initial RAM disk for the first time, Universal Restore saves a copy of it to the same directory. The name of the copy is the name of the file, followed by the _acronis_backup.img suffix. This copy will not be overwritten if you run Universal Restore more than once (for example, after you have added missing drivers).
To revert to the original initial RAM disk, do any of the following:
mv initrd-2.6.16.60-0.21-default_acronis_backup.img initrd-2.6.16.60-0.21-default