I successfully cloned a linux disk from one machine to another via a samba share using clonezilla last week. Worked like a charm but did require some manual intervention (in order to restore to a different partition scheme than where the image came from).
For imaging to network share to restore on the same machine it should work 100%.
Backup over the network took about 4 mins via gigabit lan and not a need for a spare disk or DVD burner anywhere.
Not as pretty as Acronis but the price is fantastic
Cheers,
Arkay.