With CKBox On-Premises, can use one of the following solutions to store file contents:
- S3 or any compliant storage
- Azure Blob Storage
- Physical filesystem
- MySQL
- PostgreSQL
Please note the above applies to the file contents only. All the metadata, like file names, assigned tags, categories, and folder structures are stored in a relational database (MySQL or PostgreSQL).
Refer to the documentation to read more.