不能,反着倒是可以,但你又不干:-)

http://clonezilla.org/

Limitations:

The destination partition must be equal or larger than the source one.
Differential/incremental backup is not implemented yet.
Online imaging/cloning is not implemented yet. The partition to be imaged or cloned has to be unmounted.
Software RAID/fake RAID/firmware RAID is not supported by default. It can be done manually only.
Due to the image format limitation, the image can not be explored or mounted. You can _NOT_ recovery single file from the image. However, you still have workaround to make it, read this.
Recovery Clonezilla live with multiple CDs or DVDs is not implemented yet. Now all the files have to be in one CD or DVD if you choose to create the recovery iso file.