Backup to dropbox continues to fail

In spite of executing backup several times, I get this every time. It worked fine before latest update:

[INFO] BackWPup 3.10.0; A project of Inpsyde GmbH
[INFO] WordPress 5.8.1 on https://avedorelejren.dk/
[INFO] Log Level: Normal
[INFO] BackWPup job: Grf-back-2019
[INFO] Logfile is: backwpup_log_48df7f_2021-09-30_13-58-12.html
[INFO] Backup file is: 2021-09-30_13-58-12_35SE2BIA03.zip
[30-Sep-2021 13:58:12] 1. Try to backup database …
[30-Sep-2021 13:58:12] Connected to database avedorelejren_dk_db on mysql24.unoeuro.com
[30-Sep-2021 13:58:13] Added database dump "avedorelejren_dk_db.sql.gz" with 2,52 MB to backup file list
[30-Sep-2021 13:58:13] Database backup done!
[30-Sep-2021 13:58:13] 1. Trying to make a list of folders to back up …
[30-Sep-2021 13:58:14] Added "wp-config.php" to backup file list
[30-Sep-2021 13:58:14] 2309 folders to backup.
[30-Sep-2021 13:58:14] 1. Trying to generate a file with installed plugin names …
[30-Sep-2021 13:58:14] Added plugin list file "Grundejerforeningen-Avedoerelejren.pluginlist.2021-09-30.txt" with 3,90 KB to backup file list.
[30-Sep-2021 13:58:14] 1. Trying to generate a manifest file …
[30-Sep-2021 13:58:14] Added manifest.json file with 4,66 KB to backup file list.
[30-Sep-2021 13:58:14] 1. Trying to create backup archive …
[30-Sep-2021 13:58:14] Compressing files as ZipArchive. Please be patient, this may take a moment.
[30-Sep-2021 14:01:16] Backup archive created.
[30-Sep-2021 14:01:16] Archive size is 252,24 MB.
[30-Sep-2021 14:01:16] 12719 Files with 394,34 MB in Archive.
[30-Sep-2021 14:01:17] 1. Try to send backup file to Dropbox …
[30-Sep-2021 14:01:18] Token has expired; new token has been obtained
[30-Sep-2021 14:01:18] Authenticated with Dropbox of user: System Aved?relejren
[30-Sep-2021 14:01:18] Uploading to Dropbox …
[30-Sep-2021 14:01:18] Beginning new file upload session
[30-Sep-2021 14:01:38] /var/www/avedorelejren.dk/public_html/wp-content/plugins/backwpup/src/Http/Client/WpHttpClient.php: Dropbox API: cURL error 28: Operation timed out after 5000 milliseconds with 0 out of -1 bytes received
[30-Sep-2021 14:01:39] 2. Try to send backup file to Dropbox …
[30-Sep-2021 14:01:39] Token has expired; new token has been obtained
[30-Sep-2021 14:01:39] Authenticated with Dropbox of user: System Aved?relejren
[30-Sep-2021 14:01:39] Uploading to Dropbox …
[30-Sep-2021 14:02:07] Token has expired; new token has been obtained
[30-Sep-2021 14:02:37] Token has expired; new token has been obtained
[30-Sep-2021 14:02:58] /var/www/avedorelejren.dk/public_html/wp-content/plugins/backwpup/src/Http/Client/WpHttpClient.php: Dropbox API: cURL error 28: Operation timed out after 5001 milliseconds with 0 out of -1 bytes received
[30-Sep-2021 14:02:58] 3. Try to send backup file to Dropbox …
[30-Sep-2021 14:02:59] Token has expired; new token has been obtained
[30-Sep-2021 14:02:59] Authenticated with Dropbox of user: System Aved?relejren
[30-Sep-2021 14:02:59] Uploading to Dropbox …
[30-Sep-2021 14:03:07] /var/www/avedorelejren.dk/public_html/wp-content/plugins/backwpup/src/Http/Client/WpHttpClient.php: Dropbox API: cURL error 28: Operation timed out after 5001 milliseconds with 0 out of -1 bytes received
[30-Sep-2021 14:03:08] ERROR: Step aborted: too many attempts!
[30-Sep-2021 14:03:08] ERROR: Job has ended with errors in 296 seconds. You must resolve the errors for correct execution.