Short answer:
Duplicacy Web Edition is a browser-managed desktop backup interface. The local management address defaults to 127.0.0.1:3875, and supported jobs include backup, check, copy and prune.
What each page does
Storage
Add local or cloud storage. Keep credentials and encryption passwords separate.
Backup
Select a source folder, a storage and a unique Backup ID.
Restore
Choose the storage, Backup ID and revision, then recover files to a directory.
Schedule
Set a start time and frequency, then add the appropriate job types.
License restrictions
The Web Edition offers a 30-day trial for backup operations. After that trial, creating backups requires a license. According to the developer, restore and other management operations do not require the same backup license.