On 21/08/12 15:40, Sven Tegethoff wrote:

> At my previous company, we used to do a primary backup on a local backup
> server, and then copied it over a 100mbit WAN line to a secondary
> offsite server at a colocation center over the course of the day.

If I was to do this, the 100Mb/s WAN would be saturated 24*7 - as it is 
we average 200Mb/s and spike to 800Mb/s without putting backup traffic 
over our WAN circuit.

The scenario you describe is a small enough system that tape isn't 
necessary.

> It's especially attractive if you're in an
> environment that requires a lot of restores, because disk backups are
> instantly available when you need them.

Backups are for disaster recovery.

If you have "an environment that requires a lot of restores" (ie, ID10T 
users who delete stuff they need) then you should look at 
multigenerational filesystems which allow users to haul their own rear 
ends out of the fire.

OTOH, there's nothing like telling user that you can't restore their 
critical document for a few days to make them pay attention to good 
housekeeping practices (we have a policy of making users wait at least 
48 hours. This is fully backed by management because it encourages users 
to take greater care of their data)





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