Help with backup

I tried to backup my website without success.
I followed the advice on the forum and no results.
This is the result.
what should I do?

[INFO] BackWPup 3.7.1; A project of Inpsyde GmbH
[INFO] WordPress 4.4.23 on http://cluj24h.ro/
[INFO] Log Level: Normal (translated)
[INFO] BackWPup job: Cluj24h
[INFO] Logfile is: backwpup_log_56b41a_2020-08-01_14-13-24.html
[INFO] Backup file is: 2020-08-01_14-13-24_Q3KLST3G01.zip
[01-Aug-2020 14:13:24] 1. Try to backup database …
[01-Aug-2020 14:13:24] Connected to database cluj24h on localhost:3306
[01-Aug-2020 14:15:27] Added database dump “cluj24h.sql” with 119,54 MB to backup file list
[01-Aug-2020 14:15:27] Database backup done!
[01-Aug-2020 14:15:27] 1. Trying to make a list of folders to back up …
[01-Aug-2020 14:15:36] Added “wp-config.php” to backup file list
[01-Aug-2020 14:15:36] 770 folders to backup.
[01-Aug-2020 14:15:36] 1. Trying to generate a file with installed plugin names …
[01-Aug-2020 14:15:36] Added plugin list file “Cluj24h.pluginlist.2020-08-01.txt” with 2,26 kB to backup file list.
[01-Aug-2020 14:15:36] 1. Trying to generate a manifest file …
[01-Aug-2020 14:15:36] Added manifest.json file with 2,48 kB to backup file list.
[01-Aug-2020 14:15:36] 1. Trying to create backup archive …
[01-Aug-2020 14:15:36] Compressing files as ZipArchive. Please be patient, this may take a moment.
[01-Aug-2020 14:20:38] 2. Trying to create backup archive …
[01-Aug-2020 14:32:52] 3. Trying to create backup archive …
[01-Aug-2020 15:03:55] 4. Trying to create backup archive …
[01-Aug-2020 15:08:56] 5. Trying to create backup archive …
[01-Aug-2020 15:13:58] ERROR: Step aborted: too many attempts!
[01-Aug-2020 15:13:58] 1. Try to send backup file to Dropbox …
[01-Aug-2020 15:13:59] Authenticated with Dropbox of user: Cluj 24h
[01-Aug-2020 15:13:59] Uploading to Dropbox …
[01-Aug-2020 15:13:59] WARNING: File could not be found.
[01-Aug-2020 15:13:59] ERROR: Job has ended with errors in 3635 seconds. You must resolve the errors for correct execution.