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Content gap: backup durations #4920

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cf2df50
backup duration
Blargian Dec 8, 2025
6fba523
add note on difference between CH bucket and own bucket
Blargian Dec 8, 2025
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18 changes: 18 additions & 0 deletions docs/cloud/guides/backups/01_review-and-restore-backups.md
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Expand Up @@ -156,6 +156,24 @@ SYNC SETTINGS max_table_size_to_drop=2000000000000 -- increases the limit to 2TB
Legacy Plans: For customers on legacy plans, default daily backups retained for 24 hours, are included in the storage cost.
:::

## Backup durations {#backup-durations}

Backup and restore durations depend on several factors such as the size of the database as well as the schema and the number of tables in the database.
Incremental backups will usually complete much faster than a full backup as less data is being backed up.
Restoring from an incremental backup will be slightly slower than restoring from a full backup as all incremental backups and the last full backup in the chain are included in the restore as explained above.

In our testing, we have seen that smaller backups of ~1 TB could take around 10-15 minutes or longer to back up.
Backups less than 20 TB should complete within an hour, and backing up 50 TB of data should take about 2-3 hours.
Backups get economies of scale at larger sizes, and we have seen backups of up to 1 PB for some internal services complete in about 10 hours.

:::note
Backups to external buckets may be slower than backups to ClickHouse buckets
:::

Restore durations are about the same as the backup durations.
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@Blargian Blargian Dec 8, 2025

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We recommend testing with your own database or sample data to get better estimates as the actual duration depends on several factors as outlined above.

## Configurable backups {#configurable-backups}

If you want to set up a backups schedule different from the default backup schedule, take a look at [Configurable Backups](/cloud/manage/backups/configurable-backups).
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