Where is the "index" for the music library stored?

On github is already stated that indexing media takes its time, espacialy if more than 10.000 files.
I often make a clean install of volumio and want to avoid indexing my media each time.
The nas url, the folder structure and file names stay the same…
So i wan’t to know where the index is stored.
Is it possible to copy it via ssh on a pendrive and put it back after a fresh install?

Hardware: RaspBerry PI 4
Version: Volumio 2.699

PS: even if it is tricky to backup the index, i really want to know where it is…

The mpd database file is ‘/var/lib/mpd/tag_cache.’

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Thank you!!!