Forum Discussion
Migrated files much larger in SharePoint Online than on disk
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?
10 Replies
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.
chrisvanz
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.
Paul | SLIM Applications
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.Paul
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?
No it was just standard test office files. I used Invoke-SPOMigrationEncryptUploadSubmit to migrate the files.
Here are some examples:
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?
- From where are you uploading your files: File System? Of course this is not normal behavior and it's totally unexpected
Yes it is from the local file system.
