At the other end of secure storage is having the ability to delete data completely. In some cases, you may need to delete copies of raw footage or videos stored in a specific device to protect yourself, your organisation, your sources and the subjects of your videos. There are tools like Eraser and CCleaner that will allow you to do that.
See: https://securityinabox.org/en/chapter-6 (English) and https://info.securityinabox.org/ar/chapter_06 (Arabic).
For flash / SSD storage devices, there have been some indication that ‘erasing’ data from them is not enough, and that to truly destroy what they contain, you will have to break them into pieces and get them wet.
If you don’t have time to securely delete data, one thing you can do is physically destroy the storage device.