Increasing Data Resilience of Mobile Devices with a Collaborative Backup   Service
  Whoever has had his cell phone stolen knows how frustrating it is to be unable to get his contact list back. To avoid data loss when losing or destroying a mobile device like a PDA or a cell phone, data is usually backed-up to a fixed station. However, in the time between the last backup and the failure, important data can have been produced and then lost. To handle this issue, we propose a transparent collaborative backup system. Indeed, by saving data on other mobile devices between two connections to a global infrastructure, we can resist to such scenarios. In this paper, after a general description of such a system, we present a way to replicate data on mobile devices to attain a prerequired resilience for the backup. 
Damien Martin-Guillerez (IRISA / INRIA Rennes), Michel Ban\^atre   (IRISA / INRIA Rennes), Paul Couderc (IRISA / INRIA Rennes)