Not only is it possible, it’s necessary. Septic tanks are designed to operate full for proper water/solids separation. 

 No. Some of the material in the tank is not biodegradable. This material must be pumped out.

 A. Even though the backup may have been caused by broken pipes, tree roots intruding into your lines, or some other obstruction, it is also possible that this backup is the first sign of system failure.

We recommend having your tank pumped every 2-5 years depending on how many people live in the home.