Disappearing pictures would be a problem for future searches. However, if you see these recipes, and want to save them ... simply save the picture to your phone/tablet, etc.
I keep all of my recipes in my Evernote account. If I get a handwritten one (such as the aebleskiver recipe Hilditch gave me, or my dad's cornbread recipe I found taped under the lid of his old cornmeal container) I take a picture of it with my phone and upload it to Evernote. If I see a recipe online, I use Evernote's web clipper to grab the recipe and save it. For the typed recipes in these forums, I highlight it and then copy/paste it into a note in Evernote.