How to backup the blockchain file?

Question

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.

user36303 · Accepted Answer · 2018-08-31T23:57:53.233

6

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.

edited Aug 31 '18 at 23:57

answered Oct 01 '17 at 15:16

user36303

34,858
2
57
123

The simplest solution I could ask for! – Jona Oct 02 '17 at 09:25
1

Using rsync or mdb_copy like this will copy the whole database file. Not just what's changed. – jtgrassie Mar 07 '19 at 19:23
This is not a solution. – i9pp0 Mar 13 '21 at 13:18
If it copies everything as is, edit the post to add appropriate rsync options, or add an answer with those. – user36303 Mar 13 '21 at 20:01

How to backup the blockchain file?

1 Answers1

Linked