Last night I tried to run QubesBackup, selecting an AppVM as the target, and then selecting the SMB-mounted (r/w) folder.
The backup process started, and the progress bar presented a small sliver of blue on the left, but was 0%. Nothing was ever written to the target. No errors were ever suggested by the backup process. Pretty much 0% CPU was being used in dom0.
After several hours, I closed the dom0 QubesManager window, which also closed the backup window, and tried re-running it directly as “Qubes Backup” from the menu. It claimed I had a backup running. Still nothing whatsoever written to SMB mounted folder.
Has anyone successfully written to SMB mounted share using backup?