I have a freeNAS box that I use essentially for backup purposes of all the machines at a small office.
I have the following disks:
The reason for this is that additional disks were bought every time more space was needed. The best way to use this for me is to have a unique volume and just drop everything there, I'm using JBOD at the moment. The reason for not using redundancy is basically because it's not versatile enough as I need it, ie. if I need more space tomorrow and buy a new disk, I prefer to buy whatever size is best at the moment and just add that space to my total capacity.
Mi problem with this is that if any disk fails I loose everything (obviously). This is not a problem from a data loss standpoint, since this is just a backups machine, I have the data on my main machines. My main problem is that if I loose a disk I have to rebuild the JBOD and backup everything again, which takes many days over the network.
So here is my question, is there a way to build something like a JBOD but that is resilient to loosing a disk in the sense of still having all the information of the remaining disks, so that when I have to backup again I only have to copy the information that was lost on the bad disk?
Additionally, this JBOD volume should accept to be added an additional disk without having to be rebuilt (for the same reason, I would have to re-backup everything if this is not possible).