Back up to drop box failed

Hi there,
I’ve just started using BackWPup and followed the tutorials to get it set up. However, I keep getting the same error, in that it doesn’t seem to be able to send the backup file to dropbox. I have authenticated the account during the set up process. Here is what the last part of the log looks like:

Backup archive created.
[29-Nov-2021 11:36:03] Archive size is 2.63 GB.
[29-Nov-2021 11:36:03] 36916 Files with 2.88 GB in Archive.
[29-Nov-2021 11:36:05] 1. Try to send backup file to Dropbox …
[29-Nov-2021 11:36:05] Authenticated with Dropbox of user: Jake Thomas
[29-Nov-2021 11:36:05] Uploading to Dropbox …
[29-Nov-2021 11:36:05] Beginning new file upload session
[29-Nov-2021 11:39:39] /home/customer/www/jakethomas.com.au/public_html/wp-content/plugins/backwpup/src/Http/Client/WpHttpClient.php: Dropbox API: cURL error 28: Operation timed out after 5001 milliseconds with 0 bytes received
[29-Nov-2021 11:39:39] 2. Try to send backup file to Dropbox …
[29-Nov-2021 11:39:40] Authenticated with Dropbox of user: Jake Thomas
[29-Nov-2021 11:39:40] Uploading to Dropbox …
[29-Nov-2021 11:40:00] /home/customer/www/jakethomas.com.au/public_html/wp-content/plugins/backwpup/src/Http/Client/WpHttpClient.php: Dropbox API: cURL error 28: Operation timed out after 5001 milliseconds with 0 bytes received
[29-Nov-2021 11:40:00] 3. Try to send backup file to Dropbox …
[29-Nov-2021 11:40:01] Authenticated with Dropbox of user: Jake Thomas
[29-Nov-2021 11:40:01] Uploading to Dropbox …
[29-Nov-2021 11:41:31] /home/customer/www/jakethomas.com.au/public_html/wp-content/plugins/backwpup/src/Http/Client/WpHttpClient.php: Dropbox API: cURL error 28: Operation timed out after 5001 milliseconds with 0 bytes received
[29-Nov-2021 11:41:32] ERROR: Step aborted: too many attempts!
[29-Nov-2021 11:41:32] 1. Trying to check database …
[29-Nov-2021 11:41:33] Database check done!
[29-Nov-2021 11:41:33] ERROR: Job has ended with errors in 1553 seconds. You must resolve the errors for correct execution.