Thanks Jock1e - good advice but now I'm at home and Lszarus's answer is eliciting a couple of memories.
Lazarus the 2nd - yes, thanks, that's what I did - " Acer Recovery Management". However, not having a 16GB USB drive to hand, I tried exploring other options.
16GB USB Drive? That's gonna take 4 DVDs at least, if I can find an option to use a DVD!
However, I can't remember exactly what I found but it did something and created one disk.
Looking at the other options now, I see "Acer Backup Manager"; one option lets me create a bootable DVD, another lets me "image my drive". I will investigate further but an initial read through doesn't bode well.
Anymore experienced users please feel free to chip in - any info good or bad will be investigated.