How to backup before a release upgrade from Ubuntu 18.04.5 LTS server?

[Liam Proven]

On Tue, 28 Sept 2021 at 19:54, Bo Berglund <bo.berglund at gmail.com> wrote:
[...]
> I cannot really understand the advice that I should boot my server from a USB
> thumb drive in order to do the backup with the system down. I realize that files
> will be in a stable state then, but surely there are backup schemes that work on
> a live system as well?

It is to make it easy. Doing it on a live system is not easy, as is
demonstrated by the number of messages in this thread!

Once you have your backup, restoring it is _also_ just as hard, maybe harder.

And remember, a backup you have not tested is not a backup at all.

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