This way of saving the list with IFTTT, can you tell me more about it? Do you have to install something on your computer? Is it safe? (I managed to destroy my last computer by installing weird stuff on my Apple computer, and I don't want to do it again)
Using an IFTTT recipe for saving Discover Weekly or Release Radar to an archive playlist is safe, because IFTTT only uses Spotify API calls for that. You have to create a free account on IFTTT.com and add them to your recipes. See also the number of people using them:
I'm not Benjamin, but yes, you even should create a new and empty Discover Weekly Archive playlist manually and also copy this week's tracks over manually, because the recipe will only create a new one automatically when it runs on Monday, and then the tracks of this week will be lost. But you only have to do this once, not every Monday.
Once you connect it to Spotify, you don't have to do anything else and the copied version will just show up automatically each week! Please let me know if there are any issues or missing features on twitter: @rileytomasek