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Backup
A Snapshot can be taken from the database any time and stored on a backup media. There is no support for incremental backups.
The transaction log is not getting backed up. There are 2 ways of recovering from a loss of data:
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The TX log was stored on a separate media which is still available. Then it can be replayed since the last backup.
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The TX log was lost. In this case it is possible to retrieve the part of the TX logs of all friends that pertain to us - after all they have the same transactions in their log. For a full recovery, we have to wait until all friends have been on-line.
In the case there is no backup in existence it is still possible to recover from the data of friends by querying their balances and credit information about us. The friend will not be able to conclude that we have a desperate restore requirement because this data is queried from time to time, anyway.