compress-music.sh: add -a switch to cp

compress-music.sh

@@ -14,7 +14,7 @@ cd "$source"
 find . -type d -exec mkdir -p "$destination/{}" \;
 
 # copy existing files
-find . -type f -and \( -name '*.mp3' -or -name '*.ogg' -or -name '*.m4a' -or -name '*.opus' \) -exec cp --reflink=always "{}" "$destination/{}" \;
+find . -type f -and \( -name '*.mp3' -or -name '*.ogg' -or -name '*.m4a' -or -name '*.opus' \) -exec cp -a --reflink=always "{}" "$destination/{}" \;
 
 # set +e because ffmpeg errors on .jpg, .txt, etc.
 # compress with mp3