2020-10-28 14:17:00 +01 - [Warning-Duplicati.Library.Main.Operation.Backup.UploadSyntheticFilelist-MissingTemporaryFilelist]: Expected there to be a temporary fileset for synthetic filelist (14, duplicati-ibc15eb7f514b4a01ab87c091d1775244.dindex.zip.aes), but none was found?
Is that possible big problem and can I solve that?
When a Duplicati backup is interrupted so does not complete, the next backup tries to record what got done by building a synthetic filelist (version) based on prior version plus any updates that had finished.
Due to a bug (fixed in Canary, but not Beta), you didn’t get that, but if all keeps running well, don’t worry.