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Patches to mainline rsync added support for extended attributes, particularly for supporting macOS metadata. Bombich "Carbon Copy Cloner" is a GUI app that wra

Patches to mainline rsync added support for extended attributes, particularly for supporting macOS metadata. Bombich "Carbon Copy Cloner" is a GUI app that wraps it. https://support.bombich.com/hc/en-us/articles/20686446501143-Credits#h_01HN3XNGRYMD91E8BQE6JJ56NF https://support.bombich.com/hc/en-us/articles/20686446501143... I started following Mike Bombich from his posts on macOS Server sysadmin boards; see https://web.archive.org/web/20140707182312/http://static.afp548.com/mactips/rsync.html https://web.archive.org/web/20140707182312/http://static.afp... Nathaniel Gray created a testing tool to verify the fidelity of backups; files with multiple streams, extended attributes and ACLs, all the good stuff... Backup Bouncer: https://github.com/n8gray/Backup-Bouncer https://github.com/n8gray/Backup-Bouncer See also this SwiftUI app that wraps rsync, RsyncX. https://github.com/rsyncOSX/RsyncOSX https://github.com/rsyncOSX/RsyncOSX We used to really care about this stuff, back when we were still running software from "Classic" macOS on top of our new UNIX systems. https://web.archive.org/web/20161022012615/http://blog.plasticsfuture.org/2006/03/05/the-state-of-backup-and-cloning-tools-under-mac-os-x/ https://web.archive.org/web/20161022012615/http://blog.plast...

doctorpangloss 2y ago
The problem with rsync is that it is ridiculously slow. IFileOperation (Windows) and FileManager (macOS) will do the most performant copy supported by the underlying FS. Enabling CRC checks is a checkbox in SMB and ReFS - rsync's content matching step is redundant to a modern SMB share on a modern Windows Server. Windows to Windows, IFileOperation will be like 1.5-8x faster throughput with lower CPU usage than rsync, and maybe 1.2-3x faster than doing a file copy using vanilla golang. And if you don't care about the operating systems that actually use all the complex filesystem metadata, if you only care about Linux, then you only need openrsync or simpler programs.

doctorpangloss 2y ago

The problem with rsync is that it is ridiculously slow. IFileOperation (Windows) and FileManager (macOS) will do the most performant copy supported by the underlying FS. Enabling CRC checks is a checkbox in SMB and ReFS - rsync's content matching step is redundant to a modern SMB share on a modern Windows Server. Windows to Windows, IFileOperation will be like 1.5-8x faster throughput with lower CPU usage than rsync, and maybe 1.2-3x faster than doing a file copy using vanilla golang. And if you don't care about the operating systems that actually use all the complex filesystem metadata, if you only care about Linux, then you only need openrsync or simpler programs.