Hi,
I am using Duplicati for a daily backup and a weekly backup to the same destination (same machine, but different folders of course).
The daily backups are working fine, but the weekly ones are producing this error sometimes:
Why is there an extra unknown file showing up every 6 to 10 weeks, what could be the possible cause? And why has this never happened with my other daily backup job to the same machine and even same drive, but different subfolder?
Thanks!
What Storage Type? If it’s your machine, you can maybe even name remote software.
What is transport to the destination? Presumably some sort of network? How reliable?
Check your job log, Complete log value for RetryAttempts which handle upload fail.
For details, set advanced options log-file=<path> and log-file-log-level=retry.
For what I think this is, type this in Google and read AI Overview about temporary files:
"transfer" "part extension"
Duplicati’s name ends at .aes. Anything after that, like .part, was done by transport.
As for different results, are all settings the same, including Remote volume size which
could be seen in the size of the large dblock files. Are the daily dblock often smaller?
EDIT:
What is the Remote volume size? If transport is unreliable, big files are more likely to fail.
Another factor might be upload volume. Duplicati defaults to 4 uploads at the same time,
which might stress a network. asynchronous-concurrent-upload-limit can adjust this.
I also spotted the .part extension now, that @ts678 has seen.
This extension is not created by Duplicati, but since the rest of the filename matches Duplicati’s naming it is treated as a Duplicati created file, resulting in the error.
Does there really exist a file with that name? Do you have any kind of folder-sync tools running?
Thank you, @ts678 and @kenkendk !
The backup destination is in my own home network. I am using ftp to backup the files to my router’s USB storage, then have the one folder (the weekly one) auto-synced to Deutsche Telekom Magenta Cloud.
As @kenkendk correctly assumed, this is a syncing feature built into my FritzBox router and this is most definitely the cause of the occasional *.part file.
The file is gone by now (because I clicked “repair database” in Duplicati?), but to avoid this issue caused by syncing, I will have Duplicati backup directly to the webDAV cloud destination in the future.
Thanks for helping!
