It does depend on how much you have to recover.
I have clients whose data sets take weeks to months to copy over multi gigabit links.

If you have to recover every computer in the building from a clean backup that can take a long time.
Or worse imagine you have to re-install then upgrade each system then do the restore of application data.
Because you installed these systems over years you did not do automated roll outs but each is a one of.

Lots of people have the habit of only backing up application or user data because whole system backups "take so much more space".
Then your restore process goes from a single copy of the whole system to a complex set of tasks to try and discover what configurations or hidden data is missing.

How often do people actually do a recovery to test if the backup data works.
Back in the days of tapes I worked for a company that had a bug that caused the tapes to be written with 0's.
They did have a verify step in the process where they read the data after it was written but they only verified that the checksums matched the data.
Fortunately this was found by a customer and none of the financial institutions involved had a bad day.

On 2023-11-08 09:10, Warren McPherson via talk wrote:

Recovery doesn't take that long.

That comes from experience.

The main reason they wouldn't be up again is they don't have confidence they could prevent another attack.

Taking longer than I imagine likely suggests prehistoric infrastructure.

Solving that problem for public institutions is a hard and interesting problem.

On Wed, Nov 8, 2023 at 8:52 AM James Knott via talk <talk@gtalug.org> wrote:

On 2023-11-08 08:49, Warren McPherson via talk wrote:
> What is going on with the library website?
> There was a CBC article that said there was a ransomware attack, but
> it's been down for a week and it's hard to imagine why it would take
> so long to recover unless their infrastructure was much weaker than I
> would expect.
>
It's been mentioned in the news recently and they expect to be up within
a week. Perhaps recovering from a ransomware attack is a bigger job
than you imagine.

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