I have three criteria for my Blu-ray backups: 1. I like to keep the menus and extras. 2. I remove the previews and other annoyances. 3. I burn to a 25 gb disc. I haven't been able to find a one-shot piece of software to do this (Looks like Slyce will do it but it isn't here yet.) but I have been able to combine two programs that will do the job. I use Clown_BD BD Copier to remove what I don't want. Then run BD Rebuilder to compress the output of BD Copier to a 25 gb disc. I've tried it with about a dozen discs so far with excellent results. The only caveat is the author of BD Rebuilder will not provide support when his program is used this way. Just thought I'd share.