BrentTurcotte Hi Brent. You can choose two levels of compression settings for images. The high-compression-low-disk-space is pretty good, though you will lose some image quality. I've been using the less-compressed setting for a while now though.
If it helps. My Diarium file has nearly 9000 photos, nearly 70 videos, around 130 audio files, and around 8500 entries. The Diarium file size is 3646mb.
You should be okay for now, but I would plan a drive space upgrade for a couple of years time.