I have a DS418 with 40TB, I don’t have a massive collection, but it’s respectable (350 movies, 7000 tv episodes). I have never once lost my metadata in the 5 years with this setup. I did have a hiccup when I migrated my collection to a new drive, but Infuse loads everything back quickly. Just make sure you name your files properly (e.g. “movie.title.2023.mkv” and “tv.show.S01E01.mp4”) to save yourself from the headache of incorrect metadata.
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It's because the metadata is stored in the apps cache and Apple will purge the cache when other apps need the space. With the 32 GB this will occur more often especially if you have the screen savers set to down load frequently.
I have a few 32 GB Apple TV's and setting the screen savers to never reduces the frequency of the metadata being cleared. I also use Tiny Media Manager to scrape my files and create NFOs to speed up the process if the cache gets cleared.
I have a pair of Gen1 TV 4K and I find the cache clearing happens more often when the TV is the home hub. Probably using a bunch of memory for HKSV processing of objects/face recognition. The screen saver trick does help a bit.
I just use file sharing via some USB drives connected to Time Capsules and another internal drive on another time capsule (26TB-ish total) and I don't have metadata problems.
I've been using it for 6+ years now (64GB and 128GB models).
There were some bugs in certain earlier versions of Infuse that caused my metadata to clear. But I haven’t seen it occur for a long time. You’ll likely be fine.
Great setup, by the way. You won’t be disappointed.