RVM is an archive manager that uses rsync to manage backups of multiple clients across multiple logical partitions (vaults). It has some features that some other rsync-based backup schemes lack, such as being written in C++, needing no scripts or other programs than rsync and any binaries on which rsync depends (such as SSH), the ability to manage multiple instances of rsync connections to separate clients in parallel, the ability to use multiple logical partitions (vaults) in a configurable fashion for purporses of redundancy and added reliability, and the use of hard links for files that have not changed from one archive to the next.
Many project are mirrored worldwide. Mirmon helps in monitoring these mirrors. In a concise graphic format, mirmon shows each site's history of the last two weeks, making it easy to spot stale or dead mirrors. Mirmon quietly probes a subset of the sites in a given list, writes the results in the "state" file, and generates a Web page with the results. The package includes a Perl module called Mirmon.pm; this makes it easy to write applications related to mirmon.
SafeKeep is a centralized and easy to use backup application that combines the best features of a mirror and an incremental backup. It enhances the power of rdiff-backup with simple, centralized configuration, while adding support for LVM snapshots, database dumps, and convenient SSH key management.
NexentaStor is a unified storage solution that installs on standard hardware and provides enterprise class storage at a fraction of the cost of legacy, proprietary storage solutions. NexentaStor is particularly well suited for virtualized environments thanks to the ability of NexentaStor to eliminate duplication of primary data storage, to manage the storage for virtual environments from one interface, and to leverage SSDs to address the random I/O and boot storm issues with virtual environments.
DirSync is a directory synchronizer that takes a source and destination directory as arguments and recursively ensures that the two directories are identical. It can be used to create incremental copies of large chunks of data. For example, if your file server's contents are in the directory /data, you can make a copy in a directory called /backup with the command "dirsync /data /backup." The first time you run it, all data will be copied. On subsequent runs, only the changed files are copied.
Rsyncrypto allows you to encrypt a file or a directory structure such that they can later be synchronized to another machine using rsync. This means that local changes to the plain text file result in local changes to the cipher text file. rsyncrypto compresses the plain text file prior to encrypting it with gzip using the "rsyncable" patch, which is available from the rsync sources.
changedfiles is a framework for filesystem replication, security monitoring, and/or automatic file transformations--essentially any application where you'd poll files or directories and either do something to them or send them somewhere else (or both). The difference is that the kernel tells you when they change instead of you having to poll. It's an easy real time FTP push mirror to one or multiple sites. It's also a full fledged MySQL client, so you can do realtime database operations (for example, batch imports). It consists of two parts: a kernel module (works with Linux kernel version 2.4) which reports to a device whenever a file on the filesystem changes, and a daemon which runs in user space and can be configured to do almost any action when a change to a file matching the one of the patterns it looks for is reported. The kernel module is SMP safe and has been tested on Intel, PowerPC, and Alpha.