Synced songs

[user-removed]

Hello peeps. There are some songs that arent in Spotify (at least not the versions I want). I add the folders in the desktop app and put them in playlists. My  question is simple. What if I format my PC or change a hard drive? Will the songs be removed? I dont want to create like a 100 playlists and later find out songs are missing. Its the only reason I still subbed to Google Music. It lets my to actually upload songs