Introduction

RCB (Rsync-Crypto-Backup) is a set of scripts in Bash that:

Create local backup with rsnapshot
Encrypt local backup with rsyncrypto
Sync encrypted backup to the backup server with rsync
Restore data from the backup, and
Compare the restored data with the origin

All updates and transfers are incremental. rsyncrypto ensures that doing rsync to synchronize the encrypted files to another machine will have only a small impact on rsync’s efficiency. Whole RCB project is approximately 500 lines long.

Installation and configuration was tested with Ansible role vbotka.rcb with FreeBSD backup server and Ubuntu backup clients.

Important

rsyncrypto summary: “A slightly reduced strength bulk encryption. In exchange for the reduced strength, you get the ability to rsync the encrypted files, so that local changes in the plaintext file will result in (relatively) local changes to the cyphertext file.”