

Like others said, disable password auth and setup auth keys instead.
Bonus points for moving the ssh port, using fail2ban and also setting up a tarpit with something like endlessh.
If you wanna go extreme use Wireguard to connect to your server and only allow ssh over wireguard in your firewall.
FMHY has some good ones for high quality music. Organizing your Library will also be real easy with Musicbrainz Picard.
As for mass downloading there should be some Spotify downloaders out there. Every other way will proly not be able to get 100% of your library. Just make sure to use a trusted one, because you’ll most likely have login with your account to access your saved stuff & playlists.
Personally I download from Tidal for HiFi (yt-dlp + hifi-tui) and Youtube Music (yt-dlp) for everything else.