Error on Backup process

Hello!

I have some problems when backing up.

See my error log:

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[INFO] BackWPup 3.3.1; A project of Inpsyde GmbH
[INFO] Log Level: Normal
[INFO] BackWPup job: Job with ID 1
[INFO] Logfile is: backwpup_log_7f1d06_2016-06-05_11-37-51.html
[INFO] Backup file is: backwpup_7f1d06_2016-06-05_11-37-51.zip
[05-Jun-2016 11:37:51] 1. Try to backup database …
[05-Jun-2016 11:37:51] Connected to database georreferencia01 on mysql.medgeo.com.br
[05-Jun-2016 11:37:52] Added database dump “georreferencia01.sql.gz” with 611,21 kB to backup file list
[05-Jun-2016 11:37:52] Database backup done!
[05-Jun-2016 11:37:52] 1. Trying to make a list of folders to back up …
[05-Jun-2016 11:37:53] WARNING: is_dir(): open_basedir restriction in effect. File(/home/medgeo/www/www/www/www/www/www/www/www/www/www/www/www/www/www/www/www/www/www/www/www/www/www/www/www/www/www/www/www/www/www/www/www/www/www) is not within the allowed path(s): (/home/medgeo/:/tmp:/usr/local/lib/php:./)
[05-Jun-2016 11:41:22] Added “wp-config.php” to backup file list
[05-Jun-2016 11:41:22] 31620 folders to backup.
[05-Jun-2016 11:41:23] 1. Trying to create a WordPress export to XML file …
[05-Jun-2016 11:41:24] Check WP Export file …
[05-Jun-2016 11:41:24] WP Export file is a valid WXR file.
[05-Jun-2016 11:41:24] Added XML export “Georreferenciamento.wordpress.2016-06-05.xml” with 389,03 kB to backup file list.
[05-Jun-2016 11:41:24] 1. Trying to generate a file with installed plugin names …
[05-Jun-2016 11:41:24] Added plugin list file “Georreferenciamento.pluginlist.2016-06-05.txt” with 2,80 kB to backup file list.
[05-Jun-2016 11:41:24] 1. Trying to generate a manifest file …
[05-Jun-2016 11:41:24] Added manifest.json file with 5,78 kB to backup file list.
[05-Jun-2016 11:41:37] 1. Trying to create backup archive …
[05-Jun-2016 11:41:37] Compressing files as ZipArchive. Please be patient, this may take a moment.
[05-Jun-2016 11:41:38] WARNING: File size of “/home/medgeo/www/wp-content/backupwordpress-a69fc2322e-backups/medgeo-com-br-1465069112-complete-2016-06-05-03-00-04.zip 5642971268” cannot be retrieved. File might be too large and will not be added to queue.
[05-Jun-2016 11:46:47] WARNING: File size of “/home/medgeo/www/www/wp-content/backupwordpress-a69fc2322e-backups/medgeo-com-br-1465069112-complete-2016-06-05-03-00-04.zip 5642971268” cannot be retrieved. File might be too large and will not be added to queue.
[05-Jun-2016 11:55:59] WARNING: File size of “/home/medgeo/www/www/www/wp-content/backupwordpress-a69fc2322e-backups/medgeo-com-br-1465069112-complete-2016-06-05-03-00-04.zip 5642971268” cannot be retrieved. File might be too large and will not be added to queue.

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Can I trust the backup, even with the mistakes?
Or should I fix errors and make another backup?
How to fix the errors?

Thank you very much!

https://wordpress.org/plugins/backwpup/