# Does daily snapshot of monthly indexes only track deltas?

**URL:** https://discuss.elastic.co/t/does-daily-snapshot-of-monthly-indexes-only-track-deltas/149858
**Category:** Elasticsearch
**Created:** [September 25, 2018, 2:52pm UTC](https://discuss.elastic.co/t/does-daily-snapshot-of-monthly-indexes-only-track-deltas/149858 "2018-09-25T14:52:45Z")
**Posts on this page:** 4
**Page:** 1

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### Author: ![javadevmtl](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/javadevmtl/32/45613_2.png) [@javadevmtl](https://discuss.elastic.co/u/javadevmtl)
#### Post date: [September 25, 2018, 2:52pm UTC](https://discuss.elastic.co/t/does-daily-snapshot-of-monthly-indexes-only-track-deltas/149858/1 "2018-09-25T14:52:45Z")

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Hi, I I'm currently snapshotting daily indexes, but I would like to switch to Monthly indexes. reading the docs here: [https://www.elastic.co/guide/en/elasticsearch/reference/current/modules-snapshots.html](https://www.elastic.co/guide/en/elasticsearch/reference/current/modules-snapshots.html)

It didn't specifically see anything about deltas or differences. But I'm guessing if I take a daily snapshot of the monthly index it will store only the deltas unless a merge happens which then it would snapshot what ever difference of the merge?

Is there a specific way to backup a monthly index on a daily basis?

P.s: Using S3 repository.

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### Author: ![fkelbert](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/fkelbert/32/35762_2.png) [@fkelbert](https://discuss.elastic.co/u/fkelbert)
#### Post date: [September 25, 2018, 3:03pm UTC](https://discuss.elastic.co/t/does-daily-snapshot-of-monthly-indexes-only-track-deltas/149858/2 "2018-09-25T15:03:45Z")

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Hi @javadevmtl,

Snapshots are indeed incremental. [This blog post](https://www.elastic.co/blog/found-elasticsearch-snapshot-and-restore) goes into details.

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### Author: ![javadevmtl](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/javadevmtl/32/45613_2.png) [@javadevmtl](https://discuss.elastic.co/u/javadevmtl)
#### Post date: [September 25, 2018, 9:45pm UTC](https://discuss.elastic.co/t/does-daily-snapshot-of-monthly-indexes-only-track-deltas/149858/3 "2018-09-25T21:45:23Z")

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Ok thanks!

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### Author: ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)
#### Post date: [October 23, 2018, 9:45pm UTC](https://discuss.elastic.co/t/does-daily-snapshot-of-monthly-indexes-only-track-deltas/149858/4 "2018-10-23T21:45:23Z")

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