Backup policy
The most critical data have at least a daily snapshot, while less critical data are backed up at least once a week. In order to not start with setup of the system from scratch, we create exact mirrors of the system (snapshot) automatically once a week.
The backup snapshots contains not just the current version of data that were backed up most recently but also the older versions of the data.
Using a off-site backup storage help us to complete data recovery in case of disaster recovery, even if a central server become compromised. Encryption of the critical data backups is mandatory.