During backups, an account fails to transfer all files.
[ERROR] Transfer for the account "accountname" backup was partial,
Some of the files not transferred correctly
If s3 remote backups are used, the following error could be observed in the s3 log file.
You can find the s3 log file at location "/usr/local/jetapps/var/log/jetbackup5/s3/s3.log".
Message: file `/home/accountname/public_html/error_log` changed as we read it
When uploading files to the remote server or s3, if Jetbackup encounters a file change during upload, it can trigger a partial failure on the uploaded file. File transfer between servers can experience an error message if the uploaded file has changed during the upload process. Sending a file between servers will also verify that the same file opened is the same file sent to the remote server. When a check of this nature fails, the file is uploaded, but it will also notice a change since it started uploading.
Jetbackup recommends excluding some standard files subject to frequent changes to avoid issues of this nature.
Jetbackup 5 - Backup jobs - Directories and files to exclude
Error log files or cache files generally aren't needed for a site to function if restored from backups. Try excluding the cache files or PHP error_log files for starters. Keep in mind that other files may need to be excluded, depending on how the site operates.