1. Amazon web services: Overview of security processes. https://d1.awsstatic.com/whitepapers/aws-security-whitepaper.pdf
2. Data deletion on google cloud documentation. https://cloud.google.com/docs/security
3. GCP object lifecycle management. https://cloud.google.com/storage/docs/lifecycle
4. IBM cloud object storage - overview, https://www.ibm.com/cloud/object-storage
5. Regulation (eu) 2016/679 of the European parliament and of the council (2020). Accessed June 2021. https://gdpr.eu/tag/gdpr/