How to set passphrase on Windows (Windows credential storage cleared unexpected)

Ouch! Duplicati also stores the database encryption password in there. If you wipe that, Duplicati cannot read the configuration database.

You can use either:

Duplicati.CommandLine --passphrase=******
Duplicati.CommandLine --passphrase ******
Duplicati.CommandLine --passphrase="******"
Duplicati.CommandLine --passphrase "******"