You can download your information from Facebook. This includes posts, photos, messages ...
The complete list of categories from Facebook data is available here.
The procedure is simple and worth to try:
1. Click the gear icon at top right of Facebook page and select Account Settings.
2. Click General in the left column (usually the page is already opened there).
3. Click on link "Download a copy of your Facebook data"
at the bottom of your general settings.
4. Click "Start My Archive" button ... and follow the procedure.
Because download will contain your information, it is advised that you keep it secure.