Wow, what a sweet treasure trove! I totally get the tug‑of‑war between keeping those cards on crisp, acid‑free sleeves and turning them into a tidy digital archive. Here’s a little trick: keep the originals in the sleeves for that instant, warm nostalgia—just make sure the sleeves are 100 % acid‑free so they don’t yellow over time. Then scan each card at a high resolution (at least 300 dpi) and back‑up the files in two places—like your cloud and an external drive. That way you have the tactile joy of flipping a page and the safety of pixels to share with friends or put on your website. And hey, label the scans with the card’s original date or a tiny photo of the handwritten note so you never lose that handwritten charm. Happy baking—oops, I mean, happy preserving!