Zsync is only useful if people offer zsync downloads.
#ACROSYNC ALTERNATIVE UPDATE#
There is a current paper, which reflects zsync's latest development, and which I update with new figures as I run new tests and comparisons there are also older snapshots of the technical paper, included for reference and citation. The combination of client-side rsync and HTTP is also unique to zsync, to the best of my knowledge. The special handling of compressed files is, as far as I know, entirely new and unique to zsync. zsync has special handling for gzipped files, which enables update transfers of files which are distributed in compressed form. Handling for compressed files - rsync is ineffective on compressed files, unless they are compressed with a patched version of gzip.So it works through firewalls and on shared hosting accounts, and gives less security worries. All that is needed is an HTTP/1.1-compliant web server. Rsync over HTTP - zsync provides transfers that are nearly as efficient as rsync -z or cvsup, without the need to run a special server application.Client-side rsync - zsync uses the rsync algorithm, but runs it on the client side, thus avoiding the high server load associated with rsync.Three key points explain why zsync provides a genuinely new technique for file distribution: Zsync fills a gap in the technology available for large-scale file distribution. Feedback, bugs reports and patches are welcome. Zsync is open source, distributed under version 2 of the Artistic License. zsync requires no special server software - just a web server to host the files - and imposes no extra load on the server, making it ideal for large scale file distribution. However, where rsync is designed for synchronising data from one computer to another within an organisation, zsync is designed for file distribution, with one file on a server to be distributed to thousands of downloaders. zsync downloads only the new parts of the file. It allows you to download a file from a remote server, where you have a copy of an older version of the file on your computer already.
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