Few problem after upgrade to version 3.3.3

Hi,
I’m using BackWPup to backup my website to Amazon S3.
Until 21 June I’m used the version 3.3.1 without any problem.
On 21 June, after upgrade to BackWPup version 3.3.3, I have encountered few problems.
No other change was made on the server or website.

here the log:

[INFO] BackWPup 3.3.3; A project of Inpsyde GmbH
[INFO] WordPress 4.5.3 on https://www.xxxxxxxx.com/
[INFO] Log Level: Normal
[INFO] BackWPup job: Full_Backup
[INFO] Logfile is: backwpup_log_401b8d_2016-06-21_20-52-20.html
[INFO] Backup file is: backwpup_xxxxxxxxxxxxx.zip
[21-Jun-2016 20:52:20] 1. Try to backup database …
[21-Jun-2016 20:52:20] Connected to database xxxxx on xxxxxx
[21-Jun-2016 20:52:21] Added database dump “xxxxxxxx.sql” with 5.97 MB to backup file list
[21-Jun-2016 20:52:21] Database backup done!
[21-Jun-2016 20:52:21] 1. Trying to make a list of folders to back up …
[21-Jun-2016 20:52:21] Added “wp-config.php” to backup file list
[21-Jun-2016 20:52:21] 565 folders to backup.
[21-Jun-2016 20:52:21] 1. Trying to generate a file with installed plugin names …
[21-Jun-2016 20:52:21] Added plugin list file “xxxxxxxxxx.txt” with 2.07 kB to backup file list.
[21-Jun-2016 20:52:21] 1. Trying to generate a manifest file …
[21-Jun-2016 20:52:21] Added manifest.json file with 6.84 kB to backup file list.
[21-Jun-2016 20:52:21] 1. Trying to create backup archive …
[21-Jun-2016 20:52:21] Compressing files as ZipArchive. Please be patient, this may take a moment.
[21-Jun-2016 20:52:50] ERROR: Maximum execution time of 30 seconds exceeded
[21-Jun-2016 20:52:51] 2. Trying to create backup archive …
[21-Jun-2016 20:52:53] Backup archive created.
[21-Jun-2016 20:52:53] Archive size is 409.06 MB.
[21-Jun-2016 20:52:53] 5922 Files with 545.34 MB in Archive.
[21-Jun-2016 20:52:53] 1. Trying to send backup file to S3 Service …
[21-Jun-2016 20:52:54] Connected to S3 Bucket “xxxxxxxxxxx” in eu-central-1
[21-Jun-2016 20:52:54] Checking for not aborted multipart Uploads …
[21-Jun-2016 20:52:54] Starting upload to S3 Service …
[21-Jun-2016 20:53:26] WARNING: mysqli_query(): MySQL server has gone away
[21-Jun-2016 20:53:26] WARNING: mysqli_query(): Error reading result set’s header
[21-Jun-2016 20:54:10] Backup transferred to https://s3-eu-central-1.amazonaws.com/xxxxxxxxxxxxx.zip.
[21-Jun-2016 20:54:10] WARNING: mysqli_query(): MySQL server has gone away
[21-Jun-2016 20:54:10] WARNING: mysqli_query(): Error reading result set’s header
[21-Jun-2016 20:54:10] One old log deleted
[21-Jun-2016 20:54:10] ERROR: Job has ended with errors in 110 seconds. You must resolve the errors for correct execution.

Thank you for any help
Luca

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