SQL Server 2012 Rebuild RAID Array
It is a bad thing to put backups and live files on the same san array (or even on the same SAN). Your first step should be to allocate new storage for the backups, copy the backups on to that storage and then verify at least one of those backups.  Then you should run check DB on the existing database to ensure it is not corrupt. After that create a fresh backup onto the separate storage for backups.  For extra safety I would also take the databases offline, copy the MDF and ldf files onto the backup storage or another separate storage unit and then, after the array rebuild, see if the databases will come back up and pass another check DB. If not, then you can restore the backup or copy the file copies you made from the separate storage back to the live disk. Oh and you should enable checksum on the backup if you havent already done that.  Having copies of the mdf and ldf files will give you a last resort option of data repair if the database was already corrupt.