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Delta copying disabled/reset after reconnecting drives

hori :

Jul 16, 2017

I had to do some overclocking and disabled any peripherals I didn’t want to go out in a potential blaze of glory, but this seems to have reset the delta status of both drives. I’d rather I didn’t have to re-copy everything all over again, assuming such a thing is possible as it would take several days most likely.

Is there any way to do this?

I’ll let some jobs finished, but for those I’m absolutely certain nothing has changed, is there anything I might be able to do?

hori :

Jul 16, 2017

And if not now, then in the future.

Alex Pankratov :

Jul 16, 2017



"Delta status" is a per-file affair. Disabling or unmounting a storage device should have no effect on it whatsoever.

What did make you say that the delta status was reset?

hori :

Jul 16, 2017

I could it copying every single file from the first job, even though I had barely changed anything, including files that definitely were not new nor different.

hori :

Jul 16, 2017

Just ran another paused job to check, and it’s definitely copying everything from scratch.

hori :

Jul 16, 2017

I recall having to use System Restore at some point after some faulty OC, but it only went back a day or something I think. I don’t know how the internals of bvckup2 work, though, so I could be wrong.

hori :

Jul 16, 2017

Windows 10 is also showing shortcuts to my drives on the Desktop, which it didn’t do before, so maybe something in Windows is treating them as new drives—or portable drives instead of disk drives.

Alex Pankratov :

Jul 16, 2017



Delta copying requires timestamps on backup copies to remain unchanged between backup runs. See #2 in "The caveats" section here -
https://bvckup2.com/support/forum/topic/739

I can have a look at the log entry for any large file that is being needlessly copied, see if there's anything obvious.

Right-click on the "Updating files..." entry and select "Copy block". It should look something like this:

2017.07.16 ...  1. Updating file abc.xyz
2017.07.16 ...      Details
2017.07.16 ...          Source: 256 GB, created  2016.12.16 23:58:38.111, ...
2017.07.16 ...              Raw: 274877906944 / 131263991181115440 / ...
2017.07.16 ...          Backup: 256 GB, created  2016.12.16 23:58:38.111 ...
2017.07.16 ...              Raw: 274877906944 / 131263991181115440 / ...
2017.07.16 ...      Performance
2017.07.16 ...          274.31 MBps / 287632333 bps, 15 min 55 sec
2017.07.16 ...      Completed in 15 min 55 sec, copied 601.34 MB out ...

hori :

Jul 16, 2017

Looks like it’s a timestamp change; 4ms by the look of it.

https://imgur.com/a/4zFYr

Another one had a modified date that differed by ~700ms.

Any idea what kind of actions prompts something like this?

hori :

Jul 16, 2017

Alright, so my C:\ to D:\ and E:\ backups are screwed up, but not my D:\ to E:\ ones.

This means that some kind of “event” has shifted the timestamps on my C:\ drive for some reason.

While this is an inconvenience, it means I should be able to continue most of my backup jobs without any problems, assuming I’m right here.

Good thing I unplugged the other drives before overclocking, lesson learnt I guess.

Alex Pankratov :

Jul 17, 2017


Any idea what kind of actions prompts something like this?


'Created' timestamps getting shifted and by this tiny amount is really strange. I haven't seen anything like this before. I can only guess that overclocking introduced some weird bias into BIOS clock, causing "local time" to drift against "system time"... but then it doesn't explain why there's a different shift between 'created' and 'modified' timestamps.

In other words - no idea, sorry.

hori :

Jul 17, 2017

Yeah, it’s cool, I’ve just let the jobs run with the altered timestamps.

There’s always got to be a weird edge case.

It’s a Samsung 840 EVO 500GB fwiw.

Thanks for the quick response and for looking into it; at least the log revealed what was up.

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