Backups fail after the update to Plesk Obsidian 18.0.47: The backup process failed: can’t concat str to bytes

Dmitry Bystrov

1 year ago

Symptoms

Backups in Plesk - including scheduled backups - can not be created with:

Error: The backup process failed: can't concat str to bytes
Plesk Obsidian has been recently updated to version 18.0.47.

Cause

Product issue:

#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:

How to install Plesk updates

Workaround

If update is not possible for some reason you may try the following

workaround

As a workaround, create backups including all files.

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