func backupCache() {
 queue.sync(flags: .barrier) {
 do {
 let encoder = JSONEncoder()
 let dateFormatter = ISO8601DateFormatter()
 dateFormatter.formatOptions = [.withInternetDateTime]
 encoder.dateEncodingStrategy = .custom { date, encoder in
 var container = encoder.singleValueContainer()
 try container.encode(dateFormatter.string(from: date))
 }
 let data = try encoder.encode(cachedLogs)
 try data.write(to: LogsCache.fileURL())
 self.cachedLogs = []
 } catch {
 if isDebug {
 print("Error saving Logs cache.")
 }
 }
 }
 }