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---
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title: Backup & Restore
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sort_key: C
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---
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Most important info first: **REMEMBER YOUR PASSWORD** and **BACKUP YOUR KEYSTORE**.
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## Data Directory
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Everything `geth` persists gets written inside its data directory. The default data
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directory locations are platform specific:
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* Mac: `~/Library/Ethereum`
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* Linux: `~/.ethereum`
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* Windows: `%APPDATA%\Ethereum`
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Accounts are stored in the `keystore` subdirectory. The contents of this directories
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should be transportable between nodes, platforms, implementations (C++, Go, Python).
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To configure the location of the data directory, the `--datadir` parameter can be
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specified. See [CLI Options](../interface/command-line-options) for more details.
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Note the [ethash dag](../interface/mining) is stored at `~/.ethash` (Mac/Linux) or
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`%APPDATA%\Ethash` (Windows) so that it can be reused by all clients. You can store this
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in a different location by using a symbolic link.
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## Cleanup
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Geth's blockchain and state databases can be removed with:
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```
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geth removedb
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```
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This is useful for deleting an old chain and sync'ing to a new one. It only affects data
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directories that can be re-created on synchronisation and does not touch the keystore.
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## Blockchain Import/Export
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Export the blockchain in binary format with:
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```
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geth export <filename>
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```
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Or if you want to back up portions of the chain over time, a first and last block can be
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specified. For example, to back up the first epoch:
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```
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geth export <filename> 0 29999
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```
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Note that when backing up a partial chain, the file will be appended rather than
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truncated.
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Import binary-format blockchain exports with:
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```
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geth import <filename>
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```
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_See https://github.com/ethereum/wiki/wiki/Blockchain-import-export for more info_
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And finally: **REMEMBER YOUR PASSWORD** and **BACKUP YOUR KEYSTORE**
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