Totalamp never changes your music files. It scans given folders and stores information about your music in database (things like filepath, playtime, filesize, track title etc). Database is stored in application data folder of current Windows user, see Technical information. Totalamp cannot edit ID3 or other tags or embed images to music files.
Totalamp will rewrite your lyrics files when you edit them. Set correct encoding for lyrics, see Options :: Lyrics. Backup your lyrics files first.
Totalamp will access internet only to play radio or to open this online help. Lyrics are used only locally. No other functionality or online databases are used by Totalamp.
Totalamp is a solution for local files management. No cloud features are supported.