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