My Eclipse installation got completely borked and won\'t start up, so I will likely have to reinstall it (but this is also relevant when upgrading to a new Eclipse version). I w
I don't know where it stores the websites but you can export/import sites from/to eclipse
There is a link like button named "Available Software Sites" on intall update/plugin window. There you can choose all the sites and export those sites and import on another eclipse installlation.