Troubleshooting Backup Errors on WHM / cPanel

Below are some helpful locations of files, logs etc for troubleshooting backup errors on WHM

WHM backup logs
Change date to the correct date. Should be one log per day or I guess every time a backup runs.

/usr/local/cpanel/logs/cpbackup/{date}.log

View WHM backup config

cat /var/cpanel/backups/config

View WHM remote destination config(s)
Replace *** with the appropriate name.

cat /var/cpanel/backups/***.backup_destination

Rysnc.pm file

May need to modify this file to increase time out limits if you are having issues with time out errors for backups.

/usr/local/cpanel/Cpanel/Transport/Files/Rsync.pm

This link has some more info https://forums.cpanel.net/threads/what-commands-does-cpanel-run-over-ssh-to-do-rsync-backups.671777/

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