Your data. Your devices. Nobody else. Sharu is a zero-knowledge backup and sync platform: files are encrypted on your device and synced peer-to-peer between the machines you own, so only ciphertext ever crosses the wire and there are no accounts or subscriptions to sign up for.
Under the hood it uses AES-256-GCM with keys derived via Argon2id, content-addressed storage via BLAKE3, and peer-to-peer transport over Iroh (QUIC). It is offline-first with optional relays, resolves conflicts with CRDTs, and supports always-on backup nodes for replicas on a server or NAS.
A ground-up rearchitecture of the original 2019 Sharu — same goal of user-owned, encrypted file sharing, now local-first and peer-to-peer instead of IPFS and Ethereum.