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Forum Discussion
Questions About Using RSync To Back Up ReadyNAS
I have OS 6.10.3 on a 628X ReadyNAS. I setup my first share backup to a second 628X ReadyNAS. I have several questions: 1. It looks like you can't schedule an automated backup any less frequent...
Thanks for the quick and helpful reply.
My first question was worded awkwardly. I was wondering if there was any way to do less frequent backups, like every two or three weeks. It looked like once a week was the slowest you could go.
XrayDoc88 wrote:
It looked like once a week was the slowest you could go.
That is true. Though if nothing has changed, then the backup runs quite quickly.
XrayDoc88 wrote:
Can you expand on the custom snapshots on the destination shares?
First of all, the gist on how snapshots work:
When you create a snapshot, it initially takes no space. All the data is held in common between the snapshot and the main share. If you then delete a file in the main share, it remains in the snapshot. If you re-write a block in a file in the main share, the original block remains in the snapshot (preserving the old version of the file). Over time, the amount of space used by the snapshot goes up. Exactly how much depends on how much is being deleted (or changed) in the share. Note adding new files to the main share doesn't affect snapshot space.
So if the files in a share don't change very often then the snapshots don't take much space. On the other hand, if the files change a lot (for instance a share used for torrents), then the snapshots will take a lot of space.
I don't use the "smart" snapshots because the monthly snapshots are never deleted. Over time, the space will build up. Instead, I use custom snapshots, with 3 months retention on most shares. I have one share with image backups that I set to 2 weeks retention (because the image backups are large). Those settings are on both my main NAS and the backup NAS. I think that gives me reasonable retension.
Also, I run rsync daily, and never use the "full" backup cycle. One reason is that re-writing all the files will end with the snapshot using a lot of space (the snapshot space grows even if the rewritten file is the same as the original file).
As far as space goes, the backup currently has about 11.5 TiB of data, and about 332 GiB of snapshot space. I think that's very reasonable overhead for the retention I get. Though the overhead of course depends on the "churn" in the shares.
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