Welcome to the forum @dupli
I suspect the answer is unfortunately the same as the change-password question (anyone disagree?).
What storage type is your Destination? If you can look, you’ll see
.zip files. Encrypted uses
You can also see the actual file names in <job> → Show log → Remote to confirm yours are just
While I can’t guarantee that nobody will have a workaround (you probably saw some creative methods while looking at the change-password issue), it looks unlikely. I tried just encrypting the remote backup (using the independent-but-compatible AES Crypt tool), tried out Recreate and Repair, and found that Duplicati could sort of awkwardly handle the remote file name change, but not the remote size change.
A dindex file records both the name and size of the dblock file that it indexes, and both values changed. Sometimes Duplicati can re-upload deleted dindex files from its database, but seemingly not when they never were known, e.g. if I just delete them and have Duplicati Recreate using just dlist and dblock files.
Maybe somebody else knows some way to get dindex files in the backup. They’re rather important files.