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Description of my issue: Using a suggestion in another ticket, I opened a dav-pocket account and configured akeeba backup using webdav to try to backup to google drive directly. It's not working though, once the backup finishes, I get the following error messages:
HTTP error response. (errorcode 413)
HTTP error response. (errorcode 413)

and the file isn't uploaded.
In my webdav config I have the correct username and passw, and the base URL is set to https://dav-pocket.appspot.com/docso with the Directory set to /

The log file is too big to upload, but here is the last section:
DEBUG |140402 09:35:04|====== Starting Step number 16 ======
DEBUG |140402 09:35:04|AECoreDomainFinalization::_run() Running built-in method run_post_processing
DEBUG |140402 09:35:04|Loading post-processing engine object (webdav)
INFO |140402 09:35:04|Beginning post processing file <root>/administrator/components/com_akeeba/backup/site-www.viasource.ca-20140402-133400.jpa
INFO |140402 09:35:07|More post-processing steps required for file <root>/administrator/components/com_akeeba/backup/site-www.viasource.ca-20140402-133400.jpa
DEBUG |140402 09:35:07|Not removing processed file <root>/administrator/components/com_akeeba/backup/site-www.viasource.ca-20140402-133400.jpa
DEBUG |140402 09:35:07|AECoreDomainFinalization::_run() Running built-in method run_post_processing
DEBUG |140402 09:35:07|Loading post-processing engine object (webdav)
INFO |140402 09:35:07|Continuing post processing file <root>/administrator/components/com_akeeba/backup/site-www.viasource.ca-20140402-133400.jpa
INFO |140402 09:35:10|More post-processing steps required for file <root>/administrator/components/com_akeeba/backup/site-www.viasource.ca-20140402-133400.jpa
DEBUG |140402 09:35:10|Not removing processed file <root>/administrator/components/com_akeeba/backup/site-www.viasource.ca-20140402-133400.jpa
DEBUG |140402 09:35:10|AECoreDomainFinalization::_run() Running built-in method run_post_processing
DEBUG |140402 09:35:10|Loading post-processing engine object (webdav)
INFO |140402 09:35:10|Continuing post processing file <root>/administrator/components/com_akeeba/backup/site-www.viasource.ca-20140402-133400.jpa
WARNING |140402 09:35:14|Failed to process file <root>/administrator/components/com_akeeba/backup/site-www.viasource.ca-20140402-133400.jpa
WARNING |140402 09:35:14|Error received from the post-processing engine:
WARNING |140402 09:35:14|HTTP error response. (errorcode 413) \n HTTP error response. (errorcode 413) \n HTTP error response. (errorcode 413)
DEBUG |140402 09:35:14|Not removing processed file <root>/administrator/components/com_akeeba/backup/site-www.viasource.ca-20140402-133400.jpa
DEBUG |140402 09:35:14|AECoreDomainFinalization::_run() Running built-in method kickstart_post_processing
INFO |140402 09:35:14|Getting ready to upload Kickstart
DEBUG |140402 09:35:14|AECoreDomainFinalization::_run() Running built-in method apply_quotas
DEBUG |140402 09:35:14|AECoreDomainFinalization::_run() Running built-in method apply_remote_quotas
DEBUG |140402 09:35:14|AECoreDomainFinalization::_run() Running built-in method mail_administrators
DEBUG |140402 09:35:14|AECoreDomainFinalization::_run() Running built-in method update_statistics
DEBUG |140402 09:35:14|Updating statistics
DEBUG |140402 09:35:14|Removing any old records with site-www.viasource.ca-20140402-133400.jpa filename
DEBUG |140402 09:35:14|1 records found
DEBUG |140402 09:35:14|----- Finished operation 1 ------
DEBUG |140402 09:35:14|----- Finished operation 2 ------
DEBUG |140402 09:35:14|Successful Smart algorithm on AECoreDomainFinalization
DEBUG |140402 09:35:14|Kettenrad :: Domain 'finale' has finished.
DEBUG |140402 09:35:14|====== Finished Step number 16 ======
DEBUG |140402 09:35:14|*** Engine steps batching: Break flag detected.
DEBUG |140402 09:35:14|*** Batching of engine steps finished. I will now return control to the caller.
DEBUG |140402 09:35:14|No need to sleep; execution time: 10005.758047104 msec; min. exec. time: 2000 msec
DEBUG |140402 09:35:14|Saving Kettenrad instance backend
DEBUG |140402 09:35:14|Closing SQL dump file.
DEBUG |140402 09:35:15| -- Loaded stored Akeeba Factory (backend)
DEBUG |140402 09:35:16|====== Starting Step number 17 ======
DEBUG |140402 09:35:16|Kettenrad :: BREAKING STEP BEFORE SWITCHING DOMAIN
DEBUG |140402 09:35:16|Kettenrad :: No more domains to process
DEBUG |140402 09:35:16|*** Engine steps batching: Break flag detected.
DEBUG |140402 09:35:16|*** Batching of engine steps finished. I will now return control to the caller.
DEBUG |140402 09:35:16|Sleeping for 1960.8569145203 msec, using usleep()
DEBUG |140402 09:35:18|Saving Kettenrad instance backend
DEBUG |140402 09:35:18|Closing SQL dump file.
DEBUG |140402 09:35:18| -- Loaded stored Akeeba Factory (backend)
DEBUG |140402 09:35:18|Kettenrad :: Just finished
DEBUG |140402 09:35:18|*** Batching of engine steps finished. I will now return control to the caller.
DEBUG |140402 09:35:18|Sleeping for 1959.1369628906 msec, using usleep()
DEBUG |140402 09:35:20|Will not save a finished Kettenrad instance
DEBUG |140402 09:35:20|Closing SQL dump file.
DEBUG |140402 09:44:52|Kettenrad :: Attempting to load from database (backend)
DEBUG |140402 09:44:52| -- Stored Akeeba Factory (backend) not found - hard reset
DEBUG |140402 09:44:53|
DEBUG |140402 09:45:16|Kettenrad :: Attempting to load from database (backend)
DEBUG |140402 09:45:16| -- Stored Akeeba Factory (backend) not found - hard reset
DEBUG |140402 09:45:19|
--- END OF RAW LOG ---


Any ideas?
Thanks

Same error with latest alpha. Log attached

log attached, try #2

Indeed, that was the case. I split the files in 10M chunks and it uploaded fine. Thanks!