You can export your information to a pst file. And then import the pst file back in to Outlook when you want to restore it.

Exporting:
1. Open Outlook
2. Click File
3. Click Import/Export
4. Export to a file > Personal Folder File > highlight the top folder and check the include subfolders box >
5. Browse to the location that you would like to save the PST file (i.e. your desktop)
6. Click Finish

Importing:
1. Open Outlook
2. Click File
3. Click Import/Export
4. Highlight "Import from another program or file " Click Next.
5. Select "Personal Folder File (.pst)" and then select Next
6. Select "Do not import duplicates"
7. Browse to where the pst file is
8. open the pst file, include subfolders
9. Finish