Backup & restore procedures

The Nuts node supports different backends for storing data. This page describes the backup and restore procedures per backend. A restore procedure may contain additional steps to take besides restoring the data from backup.


Private keys

The private keys are the most important of all data. When lost, all data has to be recreated which might include asking customer to re-sign certain documents. The Nuts node provides two ways of storing private keys: local filesystem and via Hashicorp Vault. Vault is the recommended store for storing private keys in a production environment. Please consult the Vault documentation on how to manage your backups.


The default storage for a Nuts node is BBolt. BBolt is a key-value store that stores data on disk. Private keys are not stored in BBolt and have their own backup/restore procedure. A BBolt store can only be accessed by a single process, so backups have to be managed by the Nuts node.

By default, the BBolt store isn’t backed up. To enable backups add these configuration options:

      directory: /opt/nuts/shelf
      interval: 1h

The directory must point to a local or mounted directory. The interval must be formatted as a number and time unit. Valid time units are s (seconds), m (minutes), h (hours).

The Nuts node will place backups at the set interval in the configured directory. It creates sub-directories for different components. The file names follow the same structure as in the node’s datadir. The backup process will write to a temporary file first and when done rename that file.

The backup process will only keep a single file per store. If you want to keep hourly, daily, and weekly backups, you can achieve this with tools like rsync and rsnapshot (or others).


Refer to the Redis documentation on how to deal with backups.


Additionally, the list of trusted VC issuers must be backed up as well. Trusted issuers of VCs are stored in vcr/trusted_issuers.yaml inside the datadir directory. If the contents of this file is your primary store for trusted issuers (you’re not managing them in an external administrative system), make sure to make a backup.


To restore a backup, follow the following steps:

  1. shutdown the node

  2. remove the following directories from the datadir: events, network, vcr, and vdr

  3. follow the restore procedure for your storage (BBolt, Redis, Hashicorp Vault)

  4. restore the vcr/trusted_issuers.yaml file inside datadir

  5. start your node


In step 3, copy network/data.db, vcr/backup-credentials.db, vcr/backup-issued-credentials.db, vcr/backup-revoked-credentials.db and vdr/didstore.db from your backup to the datadir (keep the directory structure).