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How can I periodically backup the blockchain file, without copying the entire file (just the new data that was added since the last backup)?

I tried copying only the amount of bytes by which the blockchain is larger than the backup ("filling the gap"), but that didn't seem to work - the daemon failed to load the blockchain from this backup.

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rsync copies what's changed:

rsync ~/.bitmonero/lmdb/data.mdb /mnt/wherever/monero-blockchain/data.mdb

This should be done when nothing is writing to the blockchain database file. If you need to copy while it is being written to, use mdb_copy:

mdb_copy ~/.bitmonero/lmdb /mnt/wherever/monero-blockchain/

Note how mdb_copy wants the directory, and not the file.

  • The simplest solution I could ask for! – Jona Oct 2 '17 at 9:25
  • Using rsync or mdb_copy like this will copy the whole database file. Not just what's changed. – jtgrassie Mar 7 at 19:23

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