Backup is finished with the following warning message:
Warning:hosting "example.com" Not all the data was backed up into /var/lib/psa/dumps/clients/user/domains/example.com successfully.
/bin/tar: httpdocs/path/to/some/cache/files1: Cannot stat: No such file or directory
/bin/tar: httpdocs/path/to/some/cache/files2: Cannot stat: No such file or directory
/bin/tar: httpdocs/path/to/some/cache/files3: Cannot stat: No such file or directory
Also, such warnings can occur if incremental backup is used and the option Exclude specific files from the backup in the settings of scheduled backup task is configured after the full backup is made.
Backup Manager created a list of files to back up, but at the moment when the backup task has started, some files (cache, captcha and so on)were deleted.
These warning messages can be safely ignored.
If such message is unwanted, add the path to the required files (cache, captcha and so on) to the field Exclude specific files from the backup in Plesk in Tools & Settings > Backup Manager > Schedule or in Subscriptions > example.com > Backup Manager > Schedule (the path in this field should be related to the subscription root, for example,