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I upgraded to 10.3.0 free version and now I see in emails subject: ✖ XSIBACKUP errors detected in backup job!!.... But inside I don't see any errors.
Please try running the following from the xsi-dir:
cat xsibackup-cron.log | grep error
You can also try checking the .ERR-* file in the same directory to see if it contains more details.
This may be related: [https://33hops.com/viewtopic.php?pid=804]backupConfig: not found when running cron job[/url]