Best way to secure important files in your computer

[qtako7]

External Drives with Encryption

[RackSpace]

External Drive or Cloud services.

[orionrocco07]

NAS for storage redundancy with backup to Cloud storage

[c1tyhunt3r]

Floppy

[jceros]

Reliable and secure cloud backup. 

[TeddyCross]

External HDD like G-RAID SHUTTLE 8 with cloud backup storage like Backblaze.

[MrDarkHorn]

an external drive and a secondary computer that's never going to be connected to the internet. Any file that would be open would be from your external drive first and using a virtual pc first before being save to a redundant drives. This is on top of encrypting your drives. Also have a few redundant drives in other places. If you are talking about highly sensitive files that you don't want to spread, never use cloud storage.