we are managing a pool of 40 PCs with an attached storage of up to 3 TB each. Every weekend we copy this data to 3 other PCs with several RAID5-systems inside to have some kind of backup. We chose 3 PCs to divide the network traffic a bit. But as we plan to switch to a daily incremental backup, we probably don't need that anymore.
Now we would like to improve / renew our whole "backup" system, but we haven't really a good idea about what hardware to choose. I think we would need about 100 TB of capacity for one full backup. But maybe it makes sense to build up an extensible solution, so that we can e.g. double the disk space if needed.
What kind of hardware do you suggest for this intend? Would you recommend a 100 TB NAS + another 100 TB NAS as a "mirror"? Or again some server PC with one (or more?) internal RAID5-storages? Or what else can be a good solution?