Dear Friend,
You need to buy an external hard disk that you can connect your computer with USB.and backup all your vital data such as documents, photos , music etc
I dont trust anymore external hard disks because some of mine crashed and i have seen losing their photos!!!! The best solution for me is to backup on cloud. cloud backup you can backup safe, backup photos, backup documents and any file you have.
If you was backing up your data to cloud its easy because you reinstall the software of your cloud backup and you take back all your data to your new computer.
I am doing cloud backup with backup-Easy software on the cloud with really affordable prices by providing you really good service, a free first class software and you pay for the GB you backup.
I have tried several cloud backup solutions over the last two years and now i use the Backup-easy that is powered by Asigra solution that is the most secure and stable cloud backup software.
Asigra software is agent less and with one installation you can backup all your network PCs. The software is easy to install and recover your data when you experience a data loss.
You can visit their backup-easy.com website and you can run also their package calculator to see which package is the right one for you. Prices are affordable and they give you full support
You can also contact them and they can give you promo code for 15% OFF
Hope i was helpful!!!