<p>I've downloaded the whole blockchain now I want to run a pruned node on another device. But if I klick on prune block storage in bitcoin core, it tells me that reverting this setting requres re-downloadin the entire blockchain. Is it possible to prune a copy of the blockchain I've already downloaded and if so how do I do that?</p>
<p>Thanks</p>

CC BY-SA 4.0
2021-06-29T18:38:10.070Z
Pruning doesn't require downloading again. It's if you'd want to go *back* to unpruned state that it needs to download things again (obviously, because the data isn't there anymore).
Pieter Wuille
CC BY-SA 4.0
2021-06-30T03:40:14.437Z
Ok but then how do I do that? As mentioned I can't figure out how to do it in the bitcoin core GUI. Is there a command for bitcoind that I need to use?
taway
CC BY-SA 4.0
2021-06-30T03:42:29.597Z
That sounds like you're already pruned, and you're trying to revert to unpruned state. Going from unpruned to pruned should just work.
Pieter Wuille
CC BY-SA 4.0
2021-06-30T04:52:23.273Z
No it wasn't. Turns out the warning I got in the GUI was misleading. Upon restart it didn't re-download but just pruned the blockchain I had already stored. Thx for your time!
taway
<bitcoin-core><synchronization><pruning>
Can you prune blockchain without redownloading?
taway
# Can you prune blockchain without redownloading?

(Asked by: username_0 on 2021-06-29)

I've downloaded the whole blockchain now I want to run a pruned node on another device. But if I klick on prune block storage in bitcoin core, it tells me that reverting this setting requres re-downloadin the entire blockchain. Is it possible to prune a copy of the blockchain I've already downloaded and if so how do I do that?

Thanks

**Tags:** bitcoin-core, synchronization, pruning

> **Comments:**
> **username_1**: Pruning doesn't require downloading again. It's if you'd want to go *back* to unpruned state that it needs to download things again (obviously, because the data isn't there anymore).  
> **username_0**: Ok but then how do I do that? As mentioned I can't figure out how to do it in the bitcoin core GUI. Is there a command for bitcoind that I need to use?  
> **username_1**: That sounds like you're already pruned, and you're trying to revert to unpruned state. Going from unpruned to pruned should just work.  
> **username_0**: No it wasn't. Turns out the warning I got in the GUI was misleading. Upon restart it didn't re-download but just pruned the blockchain I had already stored. Thx for your time!  

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## 0 answers

