Some people run a second Duplicati backup after the main one to backup the database from the main one (find the path from the job Advanced → Database menu), but it’s an awkward multi-step process to restore that database in order to get the main restore going. Restore → Direct restore from backup files should be faster than a full database rebuild to simply get files restored. Spend time later getting the backup back up.
Database backup question was looking to not do two Duplicati runs, but backup the database in its entirety, which possibly isn’t a whole lot worse – databases often have scattered changes that don’t deduplicate well.
Some people have local backups that they then sync remotely, or some people clone-and-change Duplicati backups for similar effect. Internet downloading can definitely be slower than accessing the data over LANs, where Duplicati (rather than the link) can become the limiting factor on how quickly the data can get moved.
Keeping backup size and versioning somewhat limited (or doing two backups, one for urgent uses) will help.
Some people are happy enough with some delay. You could test yours to see if it becomes too slow for you.