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This manual is an extension of our general Checkmk backup article: https://docs.checkmk.com/master/en/backup.html 

2021-03-17 11:10:20 --- Starting backup (Check_MK_Appliance-test+stage+106-nfs+backup+appliance to nfs-backup-appliance) ---
2021-03-17 11:10:20 Performing system backup (system.tar)
2021-03-17 11:10:25 Performing system data backup (system-data.tar)
2021-03-17 11:10:48 Performing site backup: test
Site backup failed: Failed to perform backup: [Errno 104] Connection reset by peer

Job state: Site mysite Backup

#############################################
Site backup
State Failed
Runtime Started at 2022-06-21 03:00:02, Finished at 2022-06-21 03:00:02 (Duration: 0:16:36)
Output

2022-06-21 03:00:02 — Starting backup (Check_MK-mysite+cmk2-mysite-mysite+bak to Reload) —
2022-06-21 03:00:02 Found previous incomplete backup. Cleaning up those files.
Site backup failed: Traceback (most recent call last):
File "/omd/sites/mysite/bin/omd", line 60, in <module>
omdlib.main.main()
File "/omd/versions/2.0.0p23.cee/lib/python3/omdlib/main.py", line 4022, in main
command.handler(version_info, site, global_opts, args, command_options)
File "/omd/versions/2.0.0p23.cee/lib/python3/omdlib/main.py", line 2753, in main_backup
omdlib.backup.backup_site_to_tarfile(site, fh, tar_mode, options, global_opts.verbose)
File "/omd/versions/2.0.0p23.cee/lib/python3/omdlib/backup.py", line 54, in backup_site_to_tarfile
_backup_site_files_to_tarfile(site, tar, options)
File "/omd/versions/2.0.0p23.cee/lib/python3/omdlib/backup.py", line 112, in _backup_site_files_to_tarfile
tar.add(site.dir, site.name, filter=filter_files)
File "/omd/versions/2.0.0p23.cee/lib/python3/omdlib/backup.py", line 134, in add
super(BackupTarFile, self).add(name, arcname, recursive, filter=filter)
File "/omd/versions/2.0.0p23.cee/lib/python3.8/tarfile.py", line 1977, in add
self.add(os.path.join(name, f), os.path.join(arcname, f),
File "/omd/versions/2.0.0p23.cee/lib/python3/omdlib/backup.py", line 134, in add
super(BackupTarFile, self).add(name, arcname, recursive, filter=filter)
File "/omd/versions/2.0.0p23.cee/lib/python3.8/tarfile.py", line 1977, in add
self.add(os.path.join(name, f), os.path.join(arcname, f),
File "/omd/versions/2.0.0p23.cee/lib/python3/omdlib/backup.py", line 134, in add
super(BackupTarFile, self).add(name, arcname, recursive, filter=filter)
File "/omd/versions/2.0.0p23.cee/lib/python3.8/tarfile.py", line 1977, in add
self.add(os.path.join(name, f), os.path.join(arcname, f),
File "/omd/versions/2.0.0p23.cee/lib/python3/omdlib/backup.py", line 134, in add
super(BackupTarFile, self).add(name, arcname, recursive, filter=filter)
File "/omd/versions/2.0.0p23.cee/lib/python3.8/tarfile.py", line 1977, in add
self.add(os.path.join(name, f), os.path.join(arcname, f),
File "/omd/versions/2.0.0p23.cee/lib/python3/omdlib/backup.py", line 134, in add
super(BackupTarFile, self).add(name, arcname, recursive, filter=filter)
File "/omd/versions/2.0.0p23.cee/lib/python3.8/tarfile.py", line 1977, in add
self.add(os.path.join(name, f), os.path.join(arcname, f),
File "/omd/versions/2.0.0p23.cee/lib/python3/omdlib/backup.py", line 134, in add
super(BackupTarFile, self).add(name, arcname, recursive, filter=filter)
File "/omd/versions/2.0.0p23.cee/lib/python3.8/tarfile.py", line 1971, in add
self.addfile(tarinfo, f)
File "/omd/versions/2.0.0p23.cee/lib/python3/omdlib/backup.py", line 158, in addfile
self._suspend_rrd_update(rrd_file_path)
File "/omd/versions/2.0.0p23.cee/lib/python3/omdlib/backup.py", line 169, in _suspend_rrd_update
self._send_rrdcached_command("SUSPEND %s" % path)
File "/omd/versions/2.0.0p23.cee/lib/python3/omdlib/backup.py", line 199, in _send_rrdcached_command
self._sock.sendall(("%s\n" % cmd).encode("utf-8"))
UnicodeEncodeError: 'utf-8' codec can't encode character '\udcc3' in position 122: surrogates not allowed

OMD[mysite]:~$ mv oldfilename newfilename