You may see and copy the local files of a site page that you've visited in Opera Mobile 8.65. You can see the webpage css, html, image files, text files.
Here's How:
Open X-plore(see Downloads section) or any third party file manager like BlueFTP, FExplorer etc.
Go to E:\System\Data\Opera\cache4 and you can see the local files of a site page that you've visited recently. You may copy or move these files to another folder if you want to.
Opera 8.65 Cache holds these files and consume many Kb's. If you want to save some memory, delete the cache4 folder.