I’ve been testing various backup tools, something that draws me a lot of attention is the tool’s database.
Duplicati uses Sqlite, I may be wrong but I see that most of the problems may be related to the structure of this bank.
There would be a change from this bank to another, for example Firebird.
I used the backup tool called Syncovery and to my surprise it uses Firebird.
Has shown a very stable tool.
I understand that it is not simply to change, but I leave here my suggestion.