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ReadFile() error 381

wbr :

Dec 19, 2019

I am trying out this software and it seems to work well except getting these errors. ReadFile() failed with 381
It seems to all be related to Onedrive.
Is this normal?

Alex Pankratov :

Dec 19, 2019

Error 381 stands for ERROR_CLOUD_FILE_READ_ONLY_VOLUME. Whether it's normal or not depends squarely on the context and specifics of your setup.

wbr :

Dec 19, 2019

I am getting this on all 3 of my computers I'm testing. All having onedrive installed. I take it that it can't backup the onedrive folder without getting error messages.

Alex Pankratov :

Dec 19, 2019

I cannot say anything specific based on your descriptions. The program *can* however back up to and from a properly configured OneDrive.

At the very least you need to describe your setup (is 1D a source, is it a destination, etc.) and the exact context of the errors, which you can copy- paste here by right-clicking on respective log lines.

wbr :

Dec 19, 2019

2019.12.19 08:22:00.934 (UTC-6) 2 2         1175. Copying file Users\Bill\OneDrive\Apps\SMS Backup and Restore\BackupRestoreTest.txt
2019.12.19 08:22:00.934 (UTC-6) 3 3             48 bytes, created 2019.08.27 08:46:26.153, modified 2019.08.27 05:35:43.000, archive / recall-on-access
2019.12.19 08:22:00.934 (UTC-6) 3 4                 Raw: 48 / 132113907861538243 / 132113793430000000 / 00400020
2019.12.19 08:22:00.934 (UTC-6) 0 3             ReadFile() failed with 381
2019.12.19 08:22:00.934 (UTC-6) 3 4                 Context: 0 65536


I'm not sure what your asking about Microsoft Onedrive being a source or a destination.

wbr :

Dec 19, 2019

What I'm doing is a complete C: Drive backup.

Alex Pankratov :

Dec 20, 2019

I'm not sure what your asking about Microsoft Onedrive being a source or a destination.


If you are backing up to- or from- the OneDrive. It looks like you are doing the former.

In any case, the error is mostly likely due to an OneDrive file being offline and inaccessible (as it has the Recall-On-Access attribute). You may want to exclude such files from your backup using [1].

Also, you may also want to revise your backup setup to exclude 1D folders of other user accounts from this backup, so not to have 1D files getting backed up back onto 1D. The 1D folder of _your own_ user account is automatically excluded from the backup, just make sure to use a recent version of the program.

[1] https://bvckup2.com/wip/23092019

Alex Pankratov :

Dec 20, 2019

In general though, if you want to back up your entire computer to OneDrive, you'd be better off using specialized OneDrive backup software that can speak to the cloud storage directly.

What you do know is basically you are copying every file from C:\ to the OneDrive folder, creating a local copy, and then have these copies gradually pushed out to the cloud storage. That's as inefficient and as wasteful in terms of disk space usage as it gets. It may work for smaller backups, but for the full C:\ backup it's a wrong option.

Also keep in mind that making a backup of C:\ doesn't mean that you'd be able to get it restored on a new machine and have it up and running. For that you need an altogether different type of backup software called "system backup".

wbr :

Dec 20, 2019

Thank you for your response. I must not be explaining what i'm doing correctly. I'm not backing up the entire C drive to onedrive. I am using your  software to mirror my C drive to a external hard drive. It seems to be working great except for the errors.
Thank you for your quick response.

Alex Pankratov :

Dec 23, 2019

Ah, OK. You can either download these files to your computer (see the link from my previous reply) or you can exclude them from the backup by adding

        Exclude, Files,
        Matching                              *
        Attributes, Must be Set      Recall-on-Access

rule to the rule list at the bottom of Backup Settings > Backup What.

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