backend

type Backend interface {
	// Save saves the backup from the given reader with given etcd version and revision.
	// It returns the size of the snapshot saved.
	Save(etcdVersion string, rev int64, r io.Reader) (size int64, err error)

	// GetLatest gets latest backup's name.
	// If no backup is available, returns empty string name.
	GetLatest() (name string, err error)

	// Open opens a backup file for reading
	Open(name string) (rc io.ReadCloser, err error)

	// Total returns the total number of available backups.
	Total() (int, error)

	// TotalSize returns the total size of the backups.
	TotalSize() (int64, error)

	// Purge purges backup files when backups are greater than maxBackupFiles.
	Purge(maxBackupFiles int) error
}