Jun 21 2017 12:53 AM
Jun 21 2017 12:53 AM
I am doing some migration testing and I am surprised how much larger files are when uploaded to SharePoint Online. I uploaded roughly 80GB of office files, which resulted in maxing out the storage limit I had set for the sitecollection at 200GB. Some files are triple their original size and I have checked there is only one version. The "storman.aspx" also reports larger size than the Version history. The files were uploaded using a SPOMigrationPackage. Any ideas why the files are so much larger?
Jun 21 2017 06:37 AM
Jun 21 2017 05:47 PM
I have seen file sizes change (http://techtrainingnotes.blogspot.com/2010/11/sharepoint-changes-files-as-they-are.html), but nothing like that. Any unusual files types?
I wonder if you had some ZIP files unpacked in the move?
Jun 21 2017 10:57 PM - edited Jun 21 2017 11:14 PM
No it was just standard test office files. I used Invoke-SPOMigrationEncryptUploadSubmit to migrate the files.
Here are some examples:
Jun 21 2017 11:15 PM
Jun 22 2017 01:39 AM
Yes I have checked that the nr of files and folders match.
Jun 22 2017 03:35 AM
Small increases (e.g. 10 kB for msg files) are expected but this is extreme.
I have only seen this increase for compressed tiff files where the size sometimes increases 5 folder upon uploading (SharePoint uncompresses the tiff, inserts metadata and then applies a much less efficient compression mechanism).
I would compare the contents of the pptx before and after uploading. rename the extension to zip and then unpack the file. This should provide information what is going on.
Sep 01 2018 01:11 PM
I have discovered the exact same issue... 200kB word docs have grown after sharepoint upload to 1.4MB files! There are no extra 'versions' that I can see, just the document itself; It is exactly as you have shown. I uploaded simply by syncing a folder on my desktop to the site library.
Did you happen to find out what is going on?
Jan 14 2021 10:32 AM
@Håvard Meling did you ever find a solution to this issue? I am having exactly the same problem and can't find a solution. I have just migrated all our data across to SharePoint - just normal Office files in Word and Excel, PDF files and some images. Almost every file I uploaded has a much bigger file size online than it does on the local disk. I have a backup/synch application that I wanted to use to keep an offline backup but when I analyse changes between my locally synched SharePoint sites with the original files on a hard disk, they are all same dates/times/names - but totally different file sizes. Any pointers you can give to an explanation greatly appreciated.
Jan 14 2021 10:48 PM
did you compare a file before and after uploading?
For Office files I would simply open the file with a zip tool to see the different components (e.g. xml files, images, ...). For binary files I would suggest to use the online tool https://hexed.it/
Some small changes are expected for msg and Office files but they should be in the order of 10 kB's.
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