Many of EFF s recommendations involve copying data onto an external device and then removing it from the device you ll be carrying across the border. When doing this, you will want to make sure that the data you delete is actually gone. A competent forensics examiner will be able to recover files that were merely deleted, unless you securely delete files using a data destruction tool that removes and overwrites the data in memory. 2019 was a tumultuous year for Facebook as it continued to grapple with privacy fallout after Cambridge Analytica and dealing with a slew of security challenges.
Source: https://threatpost.com/dont-just-delete-delete/91905/