Thanks for the reminder, richy. I do this for all setups downloaded or sent. I get a set and name it "BL1_richy". Then if there is something I want to change or tweak, I copy it calling it "BL1_my_richy" and tweak/change leaving the original intact. The BL1 in my example there is the abbreviation for the track name, Blackwood GP.
Then there is the cars I don't use often and end up with several setups. I don't like them all and don't end up deleting any. Then next time I use the car, I forget which set I liked. So, make sure you keep it housecleaned and purge the sets you are sure you don't like. Or you end up with 20 or so sets and don't know what the heck they all are for.