# Historian Splitter - Backfill

**URL:** <https://forum.inductiveautomation.com/t/historian-splitter-backfill/71635>\
**Category:** Ignition\
**Created:** [March 27, 2023, 1:38pm UTC](https://forum.inductiveautomation.com/t/historian-splitter-backfill/71635 "2023-03-27T13:38:20Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![tim.schultz](https://avatars.discourse-cdn.com/v4/letter/t/71e660/32.png) [@tim.schultz](https://forum.inductiveautomation.com/u/tim.schultz)\
**Post date:** [March 27, 2023, 1:38pm UTC](https://forum.inductiveautomation.com/t/historian-splitter-backfill/71635/1 "2023-03-27T13:38:20Z")

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I have a plant site that has been recording history for 5+ years. We recently set up a history splitter to continue historizing to their existing connector as primary, and then to a centralized server as secondary (coupled with a remote tag historian connection). We then use the centralized server for non-shopfloor analysis.

Is there a way to properly port the existing history from the primary database into our centralized server?

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**Author:** ![pturmel](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/pturmel/32/3295_2.png) [@pturmel](https://forum.inductiveautomation.com/u/pturmel)\
**Post date:** [March 27, 2023, 1:49pm UTC](https://forum.inductiveautomation.com/t/historian-splitter-backfill/71635/2 "2023-03-27T13:49:46Z")

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The schema is documented, but you are basically on your own. See this related discussion:

> [@Migration Historical Data](https://forum.inductiveautomation.com/t/migration-historical-data/71479):
>
> I have a Ignition setup, which uses only one database connection. Historical data tables per month have more than 200 billion rows and size more than 50GB each one. How to correctly transfer historical data tables to another database without lost data? I would like to know the correct sequence of actions. Please help.