I store my Acronis image on my external USB HDD. In the program,when asked where you want it stored you select your external drive. I do not create a secure zone anywhere. Do not know if this is what you are asking. Hope it helps J
Why create a secure zone on an external HDD. The secure zone is a protction against your C:drive developing serious faults and is meant for recovery. If you create a Full backup on an external HDD, you would simply plug it in and start from there, if you are unable to do that a secure zone would make no difference, you would have to boot from Acronis recovery disc anyway.