ThemeBackup allows you to save theme backups.

It will backup tweaks such as Anchor, Anemone, LockHTML, Xen, iWidgets, and many other tweaks it will even save IconLayout and Backgrounds.

The app has options to disable or enable what tweaks you want to be saved. By default it saves all tweak settings.

Themes are stored in var/ mobile/ Documents/ ThemeBackup you could easily share your backup with others. By pressing Backup Info it will tell you the tweaks plist that was used in the original backup.

This package installs 2 apps. Backup and ClearCache. ClearCache is used by Backup and uses the same method Anemone does to load themes. This is to ensure icons themes get applied correctly. You can also use ClearCache as a way to respring your device.

Images shown in my backup app (screenshots) were created with the Screenshot App in Cydia just choose full resolution. Backup doesnt generate screenshots, but it does give you the ability to add your own.