Direct restore from backup files can restore backed up Source files with minimal setup.
To restore files from the backup, Duplicati needs only to know how to access the files and the encryption passphrase (if any). If you do not have the passphrase, it is not possible to restore.
This will not restore your job configurations unless they’re in a backup due to manual or ServerUtil export, backup of Duplicati-server.sqlite, etc., but if you have enough minimal setup information, you can get started so you can set up further based on what you see.
The details depend on your situation and goal, e.g. do you want to continue the backup?
Migrating Duplicati to a new machine