What are the use cases?

backup

File backup will output meta data, i.e. encryption keys, and encrypted file content in chunk files.

restore

Pass in encryption keys and other meta data, then the software will restore file content from assembling chunks and decrypting them.

verify

Given the meta data from file backup, the system can verify the validity of the encrypted data.

distribute

As output from a file backup there are chunk files created containing the encrypted data. These chunks can be stored on different servers or various storage medium in a redundant way to assure successful file restore in the future.

share

Sharing the meta data with somebody else allows that user to restore the original file content.