In reply to The Lemming:
> What are the pros and cons of moving away from my reliance on JPEGs?
I was on a LR course last year and here is what the tutor told the class (IIRC - others in the know maybe can confirm):
JPEG is a lossy format. First saving losses a lot of details to get the smaller file size, and each and every subsequent saving and every opening/closing of the file even to view results in more and more losses. I think he said by the file is opened up ten times it is noticeable in the quality of the photo. On the pus side, it is a common file for sharing and normally useable in virtually all software. Best format if for general sharing. Of course you are keeping the RAW file so you can always make a new JPEG later when quality deteriorates.
As others have confirmed, the tutor said no need to change from RAW except for the specific purpose you are intending. As a pro photographer he said that was mostly dictated by his client's wishes and needs. If he had the choice and needed to save other than RAW, his preference was TIFF (albeit they have larger file sizes). TIFF he said was stable and along with PSD if using Photoshop were useful as they allowed saving of things that you might want to re-edit like layers, transparencies. He also said TIFF can normally be handled my most mainstream software out there.
LR Catalogue: basically it is LR's database of where everything is and what you did to the photos (moving, copying, editing, etc). LR backs up, if you allow it to, to the same drive it is on. This is not great as if you lose that drive, you lose not only the catalogue but also its backup. Best to change backup location to a different drive, or at least back up the back up. Backups are also useful if frequently done as if you do something that goes wrong, you can just restart LR from the backup to effectively undo what went wrong.
To save space, old backups can be deleted. Unless there is specific need to keep old backups (probably more for professional to be concerned about), the advice was to keep the last few backups only, though you in theory only need the latest backu. The idea to keep more than one was in case the last backup was corrupted somehow. Apparently it does happen.
Hope that is some help and I've remembered correctly.