Error Backup

Hi
i have problem with the plugin. I state that is installed on several sites and had no problems, but on the last continuous site receive errors.

This is log

[INFO] BackWPup 3.3.4; A project of Inpsyde GmbH
[INFO] WordPress 4.6.1 on http://exokayak.com/
[INFO] Log Level: Normal
[INFO] BackWPup job: Exo
[INFO] Logfile is: backwpup_log_349e60_2016-10-23_03-00-21.html
[INFO] Backup file is: backwpup_349e60_2016-10-23_03-00-21.zip
[23-Oct-2016 03:00:21] 1. Try to backup database …
[23-Oct-2016 03:00:22] Connected to database d91ri7t3_exo on localhost
[23-Oct-2016 03:01:08] Added database dump “d91ri7t3_exo.sql” with 38,33 MB to backup file list
[23-Oct-2016 03:01:08] Database backup done!
[23-Oct-2016 03:01:14] 1. Trying to make a list of folders to back up …
[23-Oct-2016 03:01:30] Added “wp-config.php” to backup file list
[23-Oct-2016 03:01:30] 1627 folders to backup.
[23-Oct-2016 03:01:36] 1. Trying to create a WordPress export to XML file …
[23-Oct-2016 03:01:55] Check WP Export file …
[23-Oct-2016 03:01:56] WP Export file is a valid WXR file.
[23-Oct-2016 03:01:56] Added XML export “Exo_kayak_-_Sport_Made_in_Italy.wordpress.2016-10-23.xml” with 7,11 MB to backup file list.
[23-Oct-2016 03:01:59] 1. Trying to generate a file with installed plugin names …
[23-Oct-2016 03:01:59] Added plugin list file “Exo-kayak-Sport-Made-in-Italy.pluginlist.2016-10-23.txt” with 3,70 KB to backup file list.
[23-Oct-2016 03:01:59] 1. Trying to generate a manifest file …
[23-Oct-2016 03:01:59] Added manifest.json file with 6,56 KB to backup file list.
[23-Oct-2016 03:01:59] 1. Trying to create backup archive …
[23-Oct-2016 03:01:59] Compressing files as ZipArchive. Please be patient, this may take a moment.
[23-Oct-2016 04:16:03] WARNING: Job restarts due to inactivity for more than 5 minutes.
[23-Oct-2016 04:16:04] 2. Trying to create backup archive …
[23-Oct-2016 04:24:15] WARNING: Job restarts due to inactivity for more than 5 minutes.
[23-Oct-2016 04:24:27] 2. Trying to create backup archive …
[23-Oct-2016 04:34:52] WARNING: Job restarts due to inactivity for more than 5 minutes.
[23-Oct-2016 04:35:07] 2. Trying to create backup archive …
[23-Oct-2016 04:49:59] WARNING: Job restarts due to inactivity for more than 5 minutes.
[23-Oct-2016 04:50:02] 2. Trying to create backup archive …
[23-Oct-2016 04:54:51] WARNING: Job restarts due to inactivity for more than 5 minutes.
[23-Oct-2016 05:57:26] WARNING: Job restarts due to inactivity for more than 5 minutes.
[23-Oct-2016 05:57:29] 3. Trying to create backup archive …
[23-Oct-2016 06:03:26] WARNING: Job restarts due to inactivity for more than 5 minutes.
[23-Oct-2016 06:03:35] 4. Trying to create backup archive …
[23-Oct-2016 06:11:59] WARNING: Job restarts due to inactivity for more than 5 minutes.
[23-Oct-2016 06:12:14] 5. Trying to create backup archive …
[23-Oct-2016 06:19:10] WARNING: Job restarts due to inactivity for more than 5 minutes.
[23-Oct-2016 06:19:12] 4. Trying to create backup archive …
[23-Oct-2016 06:26:19] WARNING: Job restarts due to inactivity for more than 5 minutes.
[23-Oct-2016 06:26:29] 5. Trying to create backup archive …
[23-Oct-2016 06:37:51] WARNING: Job restarts due to inactivity for more than 5 minutes.
[23-Oct-2016 06:37:51] ERROR: Step aborted: too many attempts!
[23-Oct-2016 06:37:51] 1. Try to send backup file to Dropbox …
[23-Oct-2016 06:37:52] Authenticated with Dropbox of user: Enrico Sivori
[23-Oct-2016 06:37:52] Uploading to Dropbox …
[23-Oct-2016 06:37:53] 1. Trying to check database …
[23-Oct-2016 06:37:54] Database check done!
[23-Oct-2016 06:37:54] ERROR: Job has ended with errors in 13053 seconds. You must resolve the errors for correct

Thanks