You can export downloaded chapters to backup to your computer or read on other comic apps by following these steps.

1. Open the "Collections" tab.
2. Select a title you want to export its chapters.
3. In the chapter list screen, tap the  button and choose "Export to CBZ Files".
4. The screen will change to "Export" mode, tap any chapter to export it to CBZ file. You can also use the  button to export multiple chapters by criteria.
5. After you have finished exporting, tap the "Done" button to end "Export" mode.
6. Now, connect your device to a computer running iTunes and use iTunes' File Sharing to transfer your exported files to your computer.
7. After you have finished transferring files to your computer, delete exported files from Manga Storm via iTunes' File Sharing or the "Export" tab of Manga Storm.

Tips: Exported files will be in cbz format. This is the popular format for archiving comic books to transfer over internet. To read them, please import them to Manga Storm CBR or any app you like.