Flat mates are burning fish fingers again; what should I try and save this time?

Name: Declan Norton
Age: 19
Location: Plymouth, UK
Occupation: Student

• Phone - First and foremost. I think we'd all be lost without one!
• Wallet
• Blue Folder - a folder containing mementos from different places I've been, including a rather large collection of beer labels!
• External Hard-Drive
• Laptop

While phone, wallet and laptop can easily be replaced, but the mementos I have stored in the folder and on my hard-drive are irreplaceable to me. I would never be able to get those back.