{% if not open_chain.available %} {% if open_chain.reason == 'base_too_old' %}{{ DLUX_STRINGS.sysbackup_chain_reason_old|default:'Incremental: the last full backup is older than the policy allows; take a full backup.' }}{% elif open_chain.reason == 'chain_full' %}{{ DLUX_STRINGS.sysbackup_chain_reason_full|default:'Incremental: the chain reached its length limit; take a full backup.' }}{% elif open_chain.reason == 'schema_changed' %}{{ DLUX_STRINGS.sysbackup_chain_reason_schema|default:'Incremental: the database schema changed since the last full backup; take a full backup.' }}{% else %}{{ DLUX_STRINGS.sysbackup_chain_reason_none|default:'Incremental backups become available after a full backup.' }}{% endif %} {% endif %}