If I go back to an old quest by joining a friend's game, will the ones I have done after that be deleted?
No, your own progress is always saved and keeps to be unlocked.
Only possible thing, depending on when you abondoned a quest, ist that you may have to redo a part of the quest.
Yea. If you click on "change quest" or just join a friend that is on a different quest than yours, it will change the background of your character and all, but you can always change back, nothing is lost. Whenevr you reach a checkpoint, thats it, you got it.
Yea. If you click on "change quest" or just join a friend that is on a different quest than yours, it will change the background of your character and all, but you can always change back, nothing is lost. Whenevr you reach a checkpoint, thats it, you got it.