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app/vmbackup/README.md: sync with docs/vmbackup.md after e706fb5686

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Aliaksandr Valialkin 2021-10-26 19:20:47 +03:00
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@ -103,7 +103,7 @@ The backup algorithm is the following:
These are usually the biggest and the oldest files, which are shared between backups.
5. Upload the remaining files from step 3 from `-snapshotName` to `-dst`.
The algorithm splits source files into 100 MB chunks in the backup. Each chunk stored as a separate file in the backup.
The algorithm splits source files into 1 GiB chunks in the backup. Each chunk stored as a separate file in the backup.
Such splitting minimizes the amounts of data to re-transfer after temporary errors.
`vmbackup` relies on [instant snapshot](https://medium.com/@valyala/how-victoriametrics-makes-instant-snapshots-for-multi-terabyte-time-series-data-e1f3fb0e0282) properties: