ALAC provides a 40-60% compressed ratio. I would stick to third party, FLAC or WAV if going lossless. ALAC was designed for Apple users and if storage space (a problem in 2004) is of issue to you now, then it is an option.
Software (like DbPower) can correct errors. However, in the thousands of rips I have done using MS Media Player, software such a as DbPower would have fixed only a handful of failed rips (maybe). Of course, those discs were damaged/scratched and I should not have bought them in the first place. Error correction is sales fluff and not a real time issue if you have done it thousands of times like I have.
Metadata is called up from the network in which it resides. Hence, it can change (ie varying info; different photos of artist or genre). Those who carry their music around and play in cars, etc are subject to ever changing metadata info. Meh, don't dwell on it.
Media Player (Microsoft) no longer (as of this year) downloads metadata. I have to type in tracks, etc. Since I have nearly maxed out on music, this manual aspect of ripping is not an issue for me. If I was starting new, I might change methodology for the sake of convenience.
I have backed it up to 4 different Hard Drives, one of which I keep in a large fireproof gun safe. If I lost those files I would have to call the suicide prevention hotline.
I feel you @8th-note!! One of the drawbacks with ripping music vs streaming is fear of losing your music. I have two external hard drives and when I backup every 6 months or so, I do it twice. I like your fireproof gun safe idea!! Probably better than hiring a security guard!

