Codehaus performs full system backups of all systems every day. For your own peace of mind, you may wish to backup your source system repositories to ensure continuous availability if there were a catastrophic failure of Codehaus infrastructure.
We take your data seriously (but accept no liability); we run ALL our services on managed servers with RAID-1+ on all data.
If there was a catastrophic failure (server failure, data corruption, post-war rats), then we'd fall back to our daily offsite backups.
That being said, rebuilding the servers using the system backups takes time, and if you've got a local working copy then this would mitigate the impact of the outage.