Sorry for any confusion, always the case i knew what i meant lol.
My C drive is the ssd 128GB
My old sata hdd is 500GB and 2 external HDD(320gb &160GB).
So the hdd is now a slave drive(in olden days??) containing all docs, pics and music.
This could fill up depending on how many pics i take as i shoot raw files, so for that reason i am best backing up the c drive(ssd) to an ext hdd.
Ive found using acronis confusing, simply because i have never had to use it to restore where as i have used windows restore before, and to me it was a doddle.
When i used restore in the past i rebooted to factory restore and then restored the system image.
Hope that clears up the confusion