At our organization, we have a NAS server that is being used to store photography sessions. Each one has over 100 GB. Each year, it's accumulating 10 TB of data and it's going to keep on growing. We have been backing all this up using tape (LTO-5 tapes with Symantec BackupExec). Since the size keeps on growing, the full backups of the server aren't completing overnight. How should we backup this amount of data now? Continue with tape?