> I have over 200 users with about 20 TB's of data that we backup. And I have
> a problem...
>
> THE PROBLEM
> The concept of backup is starting to lose it's meaning with desktops
> sporting 1.5 TB drives. How can we stay abreast (sp?) of backing up ever
> increasing drive sizes in workstations?
>
> CENTRALIZED BACKUPS
> a.  Let's say six months from now, 50 workstations will have a 1 TB drive
> each
> b.  and another 50 workstations with 500 GB drives,
> c.  and 50 with 250 GBs,
> d.  and the rest with 100 GB drives
>
> Quick math shows we need to backup 75%*(50 TB + 25 TB + 12.5 TB + 5TB) = 70
> TB. I can buy one 32 TB's RAID 5 array for about $12.7K not including any
> head ends. So, let's say I get by with 2 arrays  - that's about $400/TB.
>
Are all of these drives going to be 100% full?

>
> COMPARE WITH DISTRIBUTED BACKUPS
> That means we put the backup drive in each workstation and run a fd and sd
> on the same machine:
>
What happens if the hard drive on a machine goes bad?

>
> a.  For each of the 200 workstations, we use 1 TB backup drives - that's
> about $110/TB.
>
> I lose RAID 5 protection and gain in at-least 4 areas - at a quarter of the
> cost:
> a.  Avoid high-capacity RADI 5 drive corruption
> b.  All eggs are not in one array, disasters damage is isolated
> c.  the need for an off-site disaster recovery backup is reduced. Not
> eliminated, but the risk is spread out over 200 sites.
> d. I also gain in backup storage capacity.
>
> THE QUESTION
> To implement local backups, can I have 1 dir controlling 200 sd's? - one for
> each workstation as follows:
>

I have never tried 200 SDs but a dozen or so works just fine.

John

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