Hi Simon, Thanks for your clear explanation and links to the rsync website. I now know everything I want to know about the rsync protocol.
Thijs On Wed, Aug 12, 2009 at 1:01 PM, Simon Hobson <[email protected]>wrote: > Thijs de Zoete wrote: > > I've measured the transfer size myself, and it came to notice that the >> sizes sent over the connection are fairly small compared to other backup >> tools with default setups. >> I guessed the files are being gzipped before they will be transfered. >> > > No, I believe it uses the rsync protocol so only changed parts of files are > transmitted. The protocol is clever enough to work out when bits have been > inserted or deleted. For example, if you insert 1 byte at the beginning of a > 1GB file, most tools would find every block of the file to have changed and > copy a whole gig - rsync works out that the contents have moved along and > only copies a few k. > > rsync can also compress the data that is sent, but the key feature is > eliminating so much data transmission in the first place. > > Add in the facility (in the rsync tool) to limit bandwidth used to a > specific value, and you get a very powerful tool for backups across a slow > link - I've been using rsync for this for many years. > > > http://en.wikipedia.org/wiki/Rsync > http://rsync.samba.org/tech_report/tech_report.html > > -- > Simon Hobson > > Visit http://www.magpiesnestpublishing.co.uk/ for books by acclaimed > author Gladys Hobson. Novels - poetry - short stories - ideal as > Christmas stocking fillers. Some available as e-books. > > > > _______________________________________________ > rdiff-backup-users mailing list at [email protected] > http://lists.nongnu.org/mailman/listinfo/rdiff-backup-users > Wiki URL: > http://rdiff-backup.solutionsfirst.com.au/index.php/RdiffBackupWiki >
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