We have a server that is no longer being used but we must maintain access to the records on it for 7 years. It was running CentOS 5.6. It was last backed up in 2014 using the RD1000. The server had a failed HDD and we had to rebuild it. This is the first time I have even seen this server, so I can't explain the lack of raid configs and other such protections. At this point, I have replaced the HDD and reinstalled CentOs 5. I tried to access the RD1000, which does show up in GUI but is not able to be mounted. fdisk -l shows the drive but says the partition table is missing so it cannot be mounted. I tried all 5 back up disks we have stored, all of which were used Monday through Friday for back ups in 2014 and have been in storage since. It seems unlikely that all five backups have gone bad, but I also don't know how they did the back ups so they could have been doing them wrong the whole time.
I am mostly a novice with Linux but am learning quickly. Anything anyone can offer to help I would appreciate it.