On many modern platforms and to varying degrees, deleted data can be recovered with special tools. To reduce the risk of deleted data being recovered, Wickr's Secure Shredder runs whenever your Wickr app is running. The goal is to “sanitize” or overwrite deleted data, on a best-effort basis.
For those of our users who remember having manual controls over shredder in older versions of Wickr Me app: to simplify the app, we removed the configuration options to have the shredder continue to run the same way as a built-in function whenever you use the app. If you feel strongly about having manual controls, please let us know at firstname.lastname@example.org, the more users request the feature, the higher priority it gets in a product feature queue.
While Secure Shredder is a strong additional step to protect your data, please be aware that there are various platform-specific functions, including cloud backup services, that continuously make copies of files or interfere with file deletion in ways that could impact the effectiveness of this feature. For instance, your deleted data may be backed up before it’s shredded/overwritten by the shredder. So it’s important to know that the feature is built as a best effort tool to significantly reduce, not eliminate risk.