horcrux is an open source tool that’s designed to split files and keep them secure with encryption. This encryption doesn’t require remembering a passphrase or retaining a private key. Instead, the utility uses the Shamir Secret Sharing Scheme to break an encryption key into parts that can be recombined to create the original key, but only requiring a certain threshold to do so.
The tool therefore includes redundancy so that you can resurrect the original file without needing access to all of the split files.