Using the back door instead of the front door in your dream is an indication that some important changes are on the way for you.
If it was friends who used your back door, be extremely careful in considering any new ventures.
If you dreamed that burglars or strangers were trying to break in your back door, it is the contrariest dream of all; look for a windfall of money!
[1]1. Past; Gen. 18:10
2. Doubt/unbelief;
3. Undercover (hidden) Gen. 31:27;
4. Not coming in the accepted way;
5. Backsliding;
6. Low profile exit;
7. Desertion;
8. Secret sin. Luke 12:2.
[2]Dreams of a back door symbolize an escape. Perhaps you are feeling trapped in a relationship or career and you are looking for a way out.
[3]1. Change is on the way.
2. Family arguments (family members entering).
3. Secrets, especially lovers.
[4]To a large degree, similar to Backyard, Frequently, the way to escape.
Folklore: Bad omen.
[5]