The quality of your camera is to say the least -adequate. Gross overkill for web pics!
Suggest you save the originals in the highest resolution you feel comfortable with and have space to store them. this will give you a second chance if you want to go for wall posters sometime.
Jaypegs depend on your editing program I am probably one of the few who stays with Photopaint.v.9 I do this because I am happy with what I know, and in jpg format this software doesn't compress anything unless I wish it.....The Photoshop wallahs will differ with me on versatility.
In other words - perhaps shoot in top whack save like that, and use save-as for whatever you want at the time, you can always go back to the master pic.