I recently started getting this message in the log after the daily backup. There are around 50 domains and only one domain seems to be affected by this warning.
Warning: hosting "domain12.com"
Not all the data was backed up into /var/lib/psa/dumps/clients/domain12/domains/domain12.com successfully. Total space: 64424509440; Available space: 28725403648; Mounted on: /. For security reasons, backing up is performed on behalf of subscription's system user. This system user has no read access to: /var/www/vhosts/domain12.com//usr/local/psa/PMM/tmp/chngzWJ7EbI So it was not backed up. All other data was backed up successfully. To fix this issue you may grant access read/write to the file or directory for system user "domain123user" or "apache".
Warning: hosting "domain12.com"
Not all the data was backed up into /var/lib/psa/dumps/clients/domain12/domains/domain12.com successfully. Total space: 64424509440; Available space: 28725403648; Mounted on: /. For security reasons, backing up is performed on behalf of subscription's system user. This system user has no read access to: /var/www/vhosts/domain12.com//usr/local/psa/PMM/tmp/chngzWJ7EbI So it was not backed up. All other data was backed up successfully. To fix this issue you may grant access read/write to the file or directory for system user "domain123user" or "apache".