Back-up or not?
Back-up or not?
You’ve managed to set up Windows 10 in Virtualbox, so you’re ready for a dual boot with Windows 8.1 and 10. It’s wise to back up your data before proceeding, especially with a 400 GB drive on a 1 TB storage. While the risk isn’t extreme, taking care will help avoid any issues.
For the peace of mind, it might be wise to back up your data, since it's safer to be prepared than to regret it later. The chances of anything going wrong from dual booting are low.
Always make copies, always be prepared. It really helps you a lot if your storage device stops working.