# An error during backup
**URL:** https://forum.duplicati.com/t/an-error-during-backup/13717
**Category:** Support
**Created:** [January 11, 2022, 3:21pm UTC](https://forum.duplicati.com/t/an-error-during-backup/13717 "2022-01-11T15:21:54Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@michael3m](https://forum.duplicati.com/u/michael3m)
#### Post date: [January 11, 2022, 3:21pm UTC](https://forum.duplicati.com/t/an-error-during-backup/13717/1 "2022-01-11T15:21:54Z")
Hello. I keep getting error after backup job (backing files to OneDrive cloud) is done:
> [Error-Duplicati.Library.Main.Operation.TestHandler-FailedToProcessFile]: Failed to process file duplicati-b345d090b9a6a49b4a9f08f09e6ec60a3.dblock.zip.aes
Entire log can be found here: [Duplicati - Pastebin.com](https://pastebin.com/TjuDGzYK)
Would be nice if someone could explain, what’s wrong.
---
### Author:  [@drwtsn32](https://forum.duplicati.com/u/drwtsn32)
#### Post date: [January 13, 2022, 5:39am UTC](https://forum.duplicati.com/t/an-error-during-backup/13717/2 "2022-01-13T05:39:41Z")
Hello and welcome!
The relevant error in your pastebin seems to be:
```
HTTP timeout 00:01:40 exceeded
```
What back end type are you using? Have you customized the remote volume size (default is 50MB)? You may need to specify a higher value for [–http-operation-timeout](https://duplicati.readthedocs.io/en/latest/06-advanced-options/#http-operation-timeout).
---
### Author:  [@ts678](https://forum.duplicati.com/u/ts678)
#### Post date: [January 13, 2022, 4:52pm UTC](https://forum.duplicati.com/t/an-error-during-backup/13717/3 "2022-01-13T16:52:18Z")
> [@michael3m](#):
>
> Would be nice if someone could explain, what’s wrong
I think @drwtsn32 has it, especially seeing that your original post says that you use OneDrive, which has somewhat different code (compared to some other destinations) and is using the [Microsoft default timeout](https://docs.microsoft.com/en-us/dotnet/api/system.net.http.httpclient.timeout?view=netframework-4.8).
The short answer is probably the suggested one, but because you possibly are looking for the explanation:
```plaintext
"KnownFileCount": 1654,
"KnownFileSize": 84365942734,
```
suggests an oversize remote volume (dblock) size of 100 MB. Not normally a problem, but might timeout depending on Internet speed. Most people get this on uploads (many technologies are slower uploading), however you’ve uploaded about 84 GB yet are getting this timeout on [test downloads](https://duplicati.readthedocs.io/en/latest/03-using-the-graphical-user-interface/#verifying-backend-files) after actual backup.
“RetryAttempts”: 4 may be the 5 total tries on dblock file, but About → Show log → Live → Retry can say.
You can probably also press the `Verify files` button for the backup to look at its verification in isolation.
If you’ve been testing different remote volume sizes, it’s also possible you sampled a bigger one this time.
The default saved log shows the name of the test file that failed, and a fuller log (e.g. live) shows the size.