Struct BackupEngineInfo 

pub struct BackupEngineInfo {
    pub timestamp: i64,
    pub backup_id: u32,
    pub size: u64,
    pub num_files: u32,
    pub app_metadata: Vec<u8>,
}

Represents information of a backup including timestamp of the backup and the size (please note that sum of all backups’ sizes is bigger than the actual size of the backup directory because some data is shared by multiple backups). Backups are identified by their always-increasing IDs.

Fields

timestamp: i64

Timestamp of the backup

backup_id: u32

ID of the backup

size: u64

Size of the backup

num_files: u32

Number of files related to the backup

app_metadata: Vec<u8>

Application metadata passed to BackupEngine::create_new_backup_with_metadata.

Empty when the backup carries no metadata. RocksDB stores the metadata as a std::string and skips writing it when empty, so an absent value and an empty value are indistinguishable on read back.