This link has your photos going back 5 months. A bit longer than your feed & you can save them to your computer from there.
https://my.secondlife.com/dougv42/snapshots this is where you can get your photos from yesteryear...
https://community.secondlife.com/t5/General-Discussion-Forum/Profile-Feed-Older-snapshots-have-disappeared/td-p/1717175
This link will answer your questions as well