Backup chain is very important...a bad image in the backup chain will affect restore operation.
I tried interrupting the on-going backup by restart/shutdown/hard shutdown system with the following software
EaseUS Todo - I tried restart system And system restarted. After system restart, incomplete image was there in the chain in the backup folder. I started another backup & new incremental backup was created leaving the bad image in the chain...Bad Job. In the GUI, backup details, bad image was not showing up (dont know if restore operation will be affected or not?) I didn't tried shutdown/hard shutdown with Todo.