Right now unmonitored episodes aren’t automatically downloaded and replaced with a new file, but they can still be overwritten by manually downloading a file. This is a problem on certain shows with inconsistent numbering and some long running animes that don’t have the release group’s name in brackets and are thus parsed as regular shows converting episode 101 into S01E01 and replacing it. Sometimes a sequel is named too close to the original (or whole new shows are considered a second season of the first in anime) and the new episodes end up replacing the old.
What I’m proposing is an additional status that would protect those files from ever being overwritten and deleted by sonarr by mistake. The files could still be manually downloaded, there would just be an extra copy. The naming should still be different if they have different release groups or quality, but if not a simple (1) would suffice. Sonarr would only need to keep track of the first file.
Also sometimes you don’t know which release has better quality and it would be nice to have both at the same time, compare and get rid of the lower quality one. Right now you can accomplish something like that, by downloading to a temp folder and then manually moving the files outside sonarr.
It would be nice to do this within sonarr and having the extra protection for some old and hard to find episodes would give me peace of mind.
It doesn’t seem like a huge undertaking and I feel it could be worthwhile for many users.