Symptoms
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Backups in Plesk - including scheduled backups - can not be created with:
Error: The backup process failed: can't concat str to bytes
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Plesk Obsidian has been recently updated to version 18.0.47.
Cause
Product issue:
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#PPPM-13733 "Creation of a domain backup no longer fails when the “Exclude log files” or “Exclude specific files from the backup” options are enabled."
Fixed in:- Plesk Obsidian 29 September 2022 (Linux)
Resolution
Please consider updating your server:
Workaround
If update is not possible for some reason you may try the following
workaround
As a workaround, create backups including all files.
