rsync data usage

Posted by pentangleit@reddit | linux | View on Reddit | 3 comments

Hi all, and sorry for a question that is probably trivial to some.

I am currently running an XCP-ng server on one site, and backing up VMs to a repository on that site. That bit's working fine.

I have tried creating a backup job there to also push the backups to an offsite location, but they're appearing to take shedloads of bandwidth and do very little. So, I wondered if I could replace that with rsync.

My question is - with rsync being able to synchronise A to B, following the initial sync does it come down to individual files? file blocks? or what? how does it manage to keep both ends in sync without sending/receiving a pile of data?

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daemonpenguin@reddit

with rsync being able to synchronise A to B, following the initial sync does it come down to individual files?

Yes, rsync works on the file level.

how does it manage to keep both ends in sync without sending/receiving a pile of data?

By only transferring file which have changed since the last sync. From the top of the rsync manual page: "Rsync finds files that need to be transferred using a "quick check" algorithm (by default) that looks for files that have changed in size or in last-modified time."

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Keely369@reddit

By default, files.

Looks like you can configure it to do blocks but I've not done that and it comes with a warning.

https://askubuntu.com/questions/1323004/how-to-get-rsync-to-synchronize-only-new-blocks-for-blockchain