Comment 40 for bug 487720

Here's a test script to reliably trigger the bug. It basically interrupts a backup and replaces the last volume with junk (ala interrupting a backup when it's writing the last volume). It's a forced trigger of the bug (i.e. it doesn't recreate it naturally as doing so would be racy).

This bug can be hit with the gio backend (i.e. any remote server through Deja Dup), the local backend (file://), and apparently the s3 backend? Possibly others too.

I have a hacky fix for this, which is to just always redo the last block when restarting a backup. We're talking about the best approach on the mailing list.