Underscore Backup

Serverless backup solution with client side encryption with the following features. • Public-key based encryption allows continuously running backups that can only be read with a key not available on the server running the backup. • Ties into a free service that helps coordination of your backup sources, optional encryption key recovery, and coordination of sharing of backup data. However, all online services are optional, and you can run the backup software without an online account. • Provides optional paid-for storage service as part of the service offering. This is also entirely optional, and you can use any supported storage service you wish. • Pre-egress encryption means no proprietary data leaves your system in a format where it can be compromised as long as your private key is not compromised. • Allow selective sharing of backup data with other participants with complete cryptographically enforced security. • Designed from the ground up to manage very large backup sets with multiple TB of data and millions of files in a single repository. • Multi-platform support based on Java 17. Linux, Windows, and MacOS are officially supported but should run anywhere Java 17 is supported. • Low resource requirements, runs efficiently with 256MB of heap memory even if the backup sets have millions of files and terabytes of data. • Efficient storage of both large and small files with built-in deduplication of data. • Handles backing up large files with small changes in them efficiently. • Optional error correction to support unreliable storage destinations. • Encryption, error correction, and destination IO are plugin based and easily extendable. • Supports dedicated service, Dropbox, local file, Windows Shares, S3, Wasabi, Backblaze B2 and iDrive E2 for backup destinations. • Fully fledged web-based UI for both initial setup, monitoring and restore operations.