The current version of the PKP PN plugin maybe has a very tiny bug that causes errors to occur where it doesn’t find a field called export_deposit_error:
PHP Notice: Undefined index: export_deposit_error
PHP Fatal error: Uncaught Exception: DB Error: Unknown column ‘export_deposit_error’ in ‘field list’
On fresh installations, the plugin installs the schema without problems, but on upgrades from previous versions it does not update the schema.
I found this, because since I updated to the new version in OJS22.214.171.124 and PKP PN v126.96.36.199 release on 2021-07-28 I have not had any backup news, coincidentally since July 2021.
This was consistent across 15+ journals upgraded from OJS2 to OJS3.3.x
Reading your answer, what I did was add the field to the pnl_deposits table like this:
ALTER TABLE `pln_deposits` ADD `export_deposit_error` VARCHAR(1000) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL AFTER `date_modified`;
With this, the plugin finished sending error messages and I am waiting for the backups to be made in PKP-PN. (I’m crossing fingers)