Please don't reencode your entire collection to "save space", or use git for version control.
Put your lossless files on a server as a source-of-truth (with a regular cold backup somewhere else) and install a streaming server, like Navidrome[1], which will allow you to transcode on-the-fly to all of your devices. This is how you build a true "digital music collection": so that you won't regret it 5 years from now, when the site you bought your flac's from closes down/erases your files (as has happened before on Bandcamp when an artist account gets deleted!), leaving you solely with the reencoded mp3/opus files you kept, unable to move to better formats as they progress.