Vector based formats
You can export documents as PDF or SVG files. For the latter it is only possible to export one page at a time as SVG does not support multiple pages. Booth formats are vector based, you will not loose quality.
You have to open a document to export it. On the sidebar tap the Export headline and choose your export format. You need the Import/Export or the Economy Package to export PDF and SVG files.
Pixel based formats
You can share these formats, store them to a folder or into your device's gallery. You can choose between JPG and PNG, only the latter keeps transparent areas of your images.