# 2025-07-09T11:31:12Z \[error\] txindex: best block of the index not found. Please rebuild the index. Error: txindex: best block of the index not found. Please rebuild the index

**URL:** <https://community.umbrel.com/t/2025-07-09t1112z-error-txindex-best-block-of-the-index-not-found-please-rebuild-the-index-error-txindex-best-block-of-the-index-not-found-please-rebuild-the-index/23226>\
**Category:** Bitcoin and Lightning\
**Created:** [July 9, 2025, 8:09pm UTC](https://community.umbrel.com/t/2025-07-09t1112z-error-txindex-best-block-of-the-index-not-found-please-rebuild-the-index-error-txindex-best-block-of-the-index-not-found-please-rebuild-the-index/23226 "2025-07-09T20:09:59Z")\
**Posts on this page:** 1\
**Showing post:** 4

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**Author:** ![Hakuna](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.umbrel.com/hakuna/32/549_2.png) [@Hakuna](https://community.umbrel.com/u/Hakuna)\
**Post date:** [July 18, 2025, 11:39am UTC](https://community.umbrel.com/t/2025-07-09t1112z-error-txindex-best-block-of-the-index-not-found-please-rebuild-the-index-error-txindex-best-block-of-the-index-not-found-please-rebuild-the-index/23226/4 "2025-07-18T11:39:27Z")

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> [@jharris9999](#):
>
> Q1) I think the issue is that I had a power outage, and that possibly corrupted the index. I have read through some similar, older posts, but wasn’t sure if they were the best way to approach the problem. Any recommendations? Running a Raspi 5, with 8 GB, 2T hard drive attached via USB. Any recommendations on where to start and course of action?

There is no GUI option to reindex, and I don’t know how you’d run it via `bitcoin-cli` with Umbrel. But there was a similar question to this here: [Command for Reindex Blockchain](https://community.umbrel.com/t/command-for-reindex-blockchain/15873)

> [@jharris9999](#):
>
> Q2) Also, if I need to rebuild the entire index (which I understand could take hours, days or weeks), can I simply download the entire index from the web or another trusted friend’s Umbrel to save time and bandwidth?

No, since your block-storage is unique, the verification need to be done by your own system on your own.

> [@jharris9999](#):
>
> Lastly, is there CLI or Umbrel software to run a nightly backup of my entire Umbrel hard drive to another USB attached drive to avoid this situation?

Believe me, a daily snapshot of a 1TB is not something you want your system to go through. What I would rather suggest: Once your block is in sync again, stop bitcoind, copy the whole folder with `rsync` (see the equivalent for [Raspibolt here](https://raspibolt.org/guide/faq.html#backup--restore-bitcoin-data) to another SSD on your computer (don’t attach another SSD to your umbrel, it does not have enough power) via network and put it to a shelf.

Whenever your SSD is toast in the future, you don’t need to do the full IBD, but start from where you did the last transfer. It’s probably always going to be a lot faster than a reindex or complete SSD crash. Those happen more often than you’d want to.

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