# 2.0.2.9: Backend verification failed, attempting automatic cleanup
**URL:** https://forum.duplicati.com/t/2-0-2-9-backend-verification-failed-attempting-automatic-cleanup/882
**Category:** Support
**Created:** [October 2, 2017, 3:26pm UTC](https://forum.duplicati.com/t/2-0-2-9-backend-verification-failed-attempting-automatic-cleanup/882 "2017-10-02T15:26:38Z")
**Posts on this page:** 10
**Page:** 1
### Author:  [@Ednilsom](https://forum.duplicati.com/u/Ednilsom)
#### Post date: [October 2, 2017, 3:26pm UTC](https://forum.duplicati.com/t/2-0-2-9-backend-verification-failed-attempting-automatic-cleanup/882/1 "2017-10-02T15:26:38Z")
After installation of version ’ 2.0.2.9\_canary\_2017-10-01’ I’m receiving the following error:
```
Backend verification failed, attempting automatic cleanup
System.ArgumentException: Object must be a root directory ("C:\") or a drive letter ("C").
at System.IO.DriveInfo..ctor(String driveName)
at Duplicati.Library.Backend.File.GetDrive()
at Duplicati.Library.Backend.File.get_Quota()
at Duplicati.Library.Main.Operation.FilelistProcessor.RemoteListAnalysis(BackendManager backend, Options options, LocalDatabase database, IBackendWriter log, String protectedfile)
at Duplicati.Library.Main.Operation.FilelistProcessor.VerifyRemoteList(BackendManager backend, Options options, LocalDatabase database, IBackendWriter log, String protectedfile)
at Duplicati.Library.Main.Operation.BackupHandler.PreBackupVerify(BackendManager backend, String protectedfile)
```
The destination is an UNC in the format `\\\SERVER\Path`.
---
### Author:  [@tophee](https://forum.duplicati.com/u/tophee)
#### Post date: [October 3, 2017, 10:36am UTC](https://forum.duplicati.com/t/2-0-2-9-backend-verification-failed-attempting-automatic-cleanup/882/2 "2017-10-03T10:36:45Z")
Welcome to the forum! I edited your post to improve the formating. (Just added `~~~` before and after the output you pasted, see [here](https://forum.duplicati.com/t/please-post-screenshots-and-code-blocks-its-very-easy/58?u=tophee) for details).
---
### Author:  [@JonMikelV](https://forum.duplicati.com/u/JonMikelV)
#### Post date: [October 3, 2017, 3:31pm UTC](https://forum.duplicati.com/t/2-0-2-9-backend-verification-failed-attempting-automatic-cleanup/882/3 "2017-10-03T15:31:50Z")
It sound like you upgraded from something to 2.0.2.9 - if so, what version were you on before and how did you upgrade (in-app upgrade feature or manual download and install)?
Also, if possible can you provide the settings for the job that’s failing as a “Export as commandline…” (be sure to remove any personal data you might not want to share such as user name, password, finger hash, etc.).
---
### Author:  [@Ednilsom](https://forum.duplicati.com/u/Ednilsom)
#### Post date: [October 3, 2017, 5:08pm UTC](https://forum.duplicati.com/t/2-0-2-9-backend-verification-failed-attempting-automatic-cleanup/882/4 "2017-10-03T17:08:07Z")
I upgraded from 2.0.2.8 using the in-app feature.
I have another backup very similar pointing directly to a local drive and It works fine.
The configuration is:
```
"C:\Program Files\Duplicati 2\Duplicati.CommandLine.exe" backup "file://\\s0002\Data/?auth-username=xxxx&auth-password=yyy" "C:\Work\\"
--log-file="C:\Temp\Duplicati\S0002.log"
--log-level="Information"
--symlink-policy="Follow"
--log-retention="30D"
--snapshot-policy="Auto"
---send-mail-url="smtp://smtp.gmail.com:587/?starttls=when-available"
--send-mail-any-operation="true"
--send-mail-subject="Duplicati %PARSEDRESULT%, %OPERATIONNAME% report for %backup-name%"
--send-mail-to="me@gmail.com"
--send-mail-username="me@gmail.com"
--send-mail-password="xxx"
--send-mail-from="S0002 backup "
--backup-name="S0002"
--dbpath="C:\WINDOWS\system32\config\systemprofile\AppData\Roaming\Duplicati\S0002 .sqlite"
--encryption-module= --compression-module="zip"
--dblock-size="5MB"
--keep-time="6M"
--passphrase="xxx"
--no-encryption="true"
--auto-cleanup="true"
--verbose="false"
--zip-compression-level="9"
--disable-module="console-password-input"
--exclude="*.log" --exclude="*.obj" --exclude="*.sbr" --exclude="*.xdc"
```
Thanks.
---
### Author:  [@JonMikelV](https://forum.duplicati.com/u/JonMikelV)
#### Post date: [October 3, 2017, 5:52pm UTC](https://forum.duplicati.com/t/2-0-2-9-backend-verification-failed-attempting-automatic-cleanup/882/5 "2017-10-03T17:52:33Z")
Thanks for the commandline export - that all looks OK to me (ignoring likely re-formatting issues like the triple-dash before send-mail-url).
It looks like the argument exception may be a common problem with 2.0.2.9 - if you can’t wait until we hear from @kenkendk you might want to consider downgrading to 2.0.2.8, which seems to have worked for some people.
> [@Fatal Error 2.0.2.29 "Object must be a root directory ("C:\\") or a drive letter ("C")"](https://forum.duplicati.com/t/fatal-error-2-0-2-29-object-must-be-a-root-directory-c-or-a-drive-letter-c/888):
>
> \> Fatal error \> System.ArgumentException: Object must be a root directory ("C:\") or a drive letter ("C"). \> \> at System.IO.DriveInfo..ctor(String driveName) \> \> at Duplicati.Library.Backend.File.GetDrive() \> \> at Duplicati.Library.Backend.File.get\_Quota() \> \> at Duplicati.Library.Main.Operation.FilelistProcessor.RemoteListAnalysis(BackendManager backend, Options options, LocalDatabase database, IBackendWriter log, String protectedfile) \> \> at Dupl…
> [@Duplicati 2.0.2.9 won’t start](https://forum.duplicati.com/t/duplicati-2-0-2-9-won-t-start/885/8):
>
> I need to hit a translator tool to be sure, but this seems to be the same as the error mentioned in this topic:
Out of curiosity, does it work any better if you change “C:\Work\” to “C:\Work\” (just add another slash after the colon)?
---
### Author:  [@Ednilsom](https://forum.duplicati.com/u/Ednilsom)
#### Post date: [October 3, 2017, 6:23pm UTC](https://forum.duplicati.com/t/2-0-2-9-backend-verification-failed-attempting-automatic-cleanup/882/6 "2017-10-03T18:23:18Z")
> [@JonMikelV](#):
>
> Out of curiosity, does it work any better if you change “C:\Work\” to “C:\Work\” (just add another slash after the colon)?
Thanks for the answer, I’ll roll back to version \*.8
About the quote, I’m fairly sure the problem isn’t in the source part but in the destination, as I said I have another backup just like this one, but pointing to a local drive and folder and it works fine.
I have another one, with different sources sent to DropBox and it also works fine.
Nevertheless I made the change and started, the result is the same.
---
### Author:  [@JonMikelV](https://forum.duplicati.com/u/JonMikelV)
#### Post date: [October 3, 2017, 7:22pm UTC](https://forum.duplicati.com/t/2-0-2-9-backend-verification-failed-attempting-automatic-cleanup/882/7 "2017-10-03T19:22:42Z")
Thanks for testing. I suspect this is a regression issue POSSIBLY related to one of the changes around commit #2763 or so.
I can’t find the reference now but I thought I saw a change implementing a new IQuota interface and I know it’s easy to miss things when shifting to interfaces.
@kenkendk, what’s the best way to bring issues like this to your attention (here, Github, PM, …)?
---
### Author:  [@JonMikelV](https://forum.duplicati.com/u/JonMikelV)
#### Post date: [October 3, 2017, 10:03pm UTC](https://forum.duplicati.com/t/2-0-2-9-backend-verification-failed-attempting-automatic-cleanup/882/8 "2017-10-03T22:03:50Z")
It hasn’t been made available in a release yet but it looks like there might be a fix for this issue submitted at Github.
>
Oh, and I’m curious whether or not adding the `--quota-size=` parameter gets around the issue (if you feel like testing).
---
### Author:  [@Ednilsom](https://forum.duplicati.com/u/Ednilsom)
#### Post date: [October 4, 2017, 10:13am UTC](https://forum.duplicati.com/t/2-0-2-9-backend-verification-failed-attempting-automatic-cleanup/882/9 "2017-10-04T10:13:46Z")
> [@JonMikelV](#):
>
> Oh, and I’m curious whether or not adding the --quota-size= parameter gets around the issue (if you feel like testing).
Nope, same error with the --quota-size= parameter.
---
### Author:  [@JonMikelV](https://forum.duplicati.com/u/JonMikelV)
#### Post date: [October 4, 2017, 12:20pm UTC](https://forum.duplicati.com/t/2-0-2-9-backend-verification-failed-attempting-automatic-cleanup/882/10 "2017-10-04T12:20:47Z")
> [@Ednilsom](#):
>
> Nope, same error with the --quota-size= parameter.
Oh, well - it was worth a try, guess we’ll have to wait for the GetDriveFreeSpaceEx fix to come out in a Canary release. Thanks for testing!