[fletch]

I keep all of my photos on Lightroom as RAW files in folders by date and named. I keyword all images and then go through and flag images.

Flagged means keeper that will have some editing done to it, whether just a preset to full photoshopping. I flag all images I want to show people, whether its a social snapshot or full on photography type shot.
Unflagged means not sure yet no further work
Rejected means one day it will get deleted as I need the space

I back up my raw files and my lightroom catalogue so I don't loose my pics or my edits (I'm considering switching to DNG and writing the edits to file as well)

I only export from Lightroom to temporary files that I need for a certain application such as uploading to the web or printing. I delete these files when I am done.

I know some people like to back up their final files to 16 bit TIFF as a back up of completed work but this tends to be pros who rely on an image catalogue as their livelyhood. I consider RAW and catalogue back ups sufficent and if I need a file I just output from LR as required.

So to answer your question; Is this a problem for you?

No, infact lightroom makes it much easier as I don't need multiple different versions of my files stored all over the place in multiple different formats (Just the RAWs, list of edit instructions and the ocasional PSD if I have had to go to photoshop)