This document describes WalB, a Linux kernel device driver that provides efficient backup and replication of storage using block-level write-ahead logging (WAL). It has negligible performance overhead and avoids issues like fragmentation. WalB works by wrapping a block device and writing redo logs to a separate log device. It then extracts diffs for backup/replication. The document discusses WalB'
Hmm. Did that help? Maybe prose is more useful after all. Reasons bup is awesome bup has a few advantages over other backup software: It uses a rolling checksum algorithm (similar to rsync) to split large files into chunks. The most useful result of this is you can backup huge virtual machine (VM) disk images, databases, and XML files incrementally, even though they're typically all in one huge fi
Easy Automated Snapshot-Style Backups with Linux and Rsync page last modified 2004.01.04 Updates: As of rsync-2.5.6, the --link-dest option is now standard! That can be used instead of the separate cp -al and rsync stages, and it eliminates the ownerships/permissions bug. I now recommend using it. Also, I'm proud to report this article is mentioned in Linux Server Hacks, a new (and very good, in m
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