---
title: "Backup"
description: "the daily verified backup of the database, with the lakehouse's catalogue and manifest beside it"
section: concepts
address: /concepts/backup
contract: 0476e35e6e275db5
---

# Backup

the daily verified backup of the database, with the lakehouse's catalogue and manifest beside it

[figure: Backup is a work at platform scope. The drawing shows its fields and the objects that they point at.]

| property | value |
|---|---|
| kind | work |
| scope | platform |
| key | the day |
| store | postgres |
| family | operations |



## Fields


| field | type | required | note |
|---|---|---|---|
| `day` | `date` | yes |  |
| `copy` | `text` | yes |  |
| `bytes` | `bytes` | yes |  |
| `tables` | `count` | yes |  |
| `discrepancies` | `count` | yes | ready only at zero |
| `rows` | `count` | yes | the rows the copy holds over its tables, as the verifier counted them |
| `log_hash` | `hash` | yes | the hash of the log inside the copy, as the verifier read it; the drill compares against it |
| `lake_manifest` | [LakeFile](/concepts/lakefile) | yes |  |
| `made_at` | `time` | yes |  |



## Routes that use it
No route takes or returns Backup directly. The record holds it, and the objects that point at it reach it.