Don’t over-process or retouch your photos, and never crop them.
Memento lets you adjust cropping and zoom, then undo those choices without losing any of the image content.
Apply color effects in Memento, rather than reversioning your images in your editing software.
If you do need a little retouching, use Memento’s direct-to-editor feature to fix only the photos that made it into the album, rather than the entire set.