If new music files are added to the library, these need to be re-scanned manually, can be done on the fly, the server does stop and start. I suppose for an album it;s tolerable, but a box set may see an interruption. Roon has its days, sometimes indexing works right away, other times, it takes its sweet time. If the PC reboots, it will re-scan all the folders. It's quick, but not immediate, Roon is just a few seconds, on the iPad about 10s something to wake up.