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Hi there.

I am trying to perform a store upgrade as I've been having trouble with the site lately. Something may be broken.
For some reason, when I try to do a backup of the DB (Via DB Backup) I get an error "The backup file does not exist". I am not trying to restore from a previous, I just want to backup before performing the upgrade. I can't proceed

I don't know how to progress from there, so I did a whole of host backup the other day for safety's sake and have downloaded for safekeeping.

When I go over to Update Assistant, I select the one option available to me 8.2.1 and click through to backup from there. That all progresses for quite a while, then I get a couple of failures- see below. 

I am normally reluctant to progress the upgrade without backup, but perhaps too much is busted...
What does the hive mind think?

I'm kind of stuck. Suggestions and advice appreciated.

Alan