Data Hoarder

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We are digital librarians. Among us are represented the various reasons to keep data -- legal requirements, competitive requirements, uncertainty of permanence of cloud services, distaste for transmitting your data externally (e.g. government or corporate espionage), cultural and familial archivists, internet collapse preppers, and people who do it themselves so they're sure it's done right. Everyone has their reasons for curating the data they have decided to keep (either forever or For A Damn Long Time (tm) ). Along the way we have sought out like-minded individuals to exchange strategies, war stories, and cautionary tales of failures.

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Checking file integrity after copying using Teracopy (alien.top)

submitted 2 years ago by thelightingthief@alien.top to c/datahoarder@selfhosted.forum

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Hi all! I've been transferring a bunch of stuff from my portable harddrives to my synology. After transferring using Synology's file transfer and connecting the harddrive directly, I've completed a handful. I started worrying about the file integrity of these transfers since synology really doesn't tell you what files failed and etc. So I started using Teracopy to transfer all the files instead. Can I use Teracopy to verify files that are already transferred that didn't use Teracopy?
Like plug harddrive into PC, and then "Source F:\" and "Target Nas location" and click verify. Does that work... sorry very new to data hoarding. Thanks in advanced

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[–] Hoardy_Lizard@alien.top 1 points 2 years ago (1 children)

If you have set Teracopy to verify upon moving and copying, original and copy should be identical. You can automatically save the checksums for re-verification later on.

Transferring (moving) or copying?

It's better to copy, so you retain your original as a "backup," in case something goes wrong at some later time. Then you can always re-check integrity in the future.

I use Beyond Compare on whole drives/volumes to compare/verify integrity and re-synchronize/update from time to time.

[–] thelightingthief@alien.top 1 points 2 years ago (1 children)

copying, but that’s the thing. These files were already copied using windows file explorer. I was wondering if Teracopy can verify the file integrity between the original and the new location

[–] Hoardy_Lizard@alien.top 1 points 2 years ago

I don't think Teracopy can compare files.

Beyond Compare does, it's a wonderful tool for comparing files, directories, even whole drives, and is darn fast at it. It has a very good (graphical) interface too.

You can use other programs (many are free) to generate hash values of files. Then you can compare the results side by side. This can be done manually or even semi-automatically, using a script.

I sometimes use MultiPar (it's free) to create some redundancy (protection) blocks, to repair files or folders that got broken/corrupted.