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How much OneDrive for Business storage do I have?
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These names aren't allowed for files or folders: .lock, CON, PRN, AUX, NUL, COM0 - COM9, LPT0 - LPT9, _vti_, desktop.ini, or any filename starting with ~$.
Notes
"_vti_" cannot appear anywhere in a file name
"forms" isn't supported when the folder is at the root level for a library.
You can’t create a folder name in SharePoint that begins with a tilde (~).
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Number of items that can be synced or copied
When using http://onedrive.com , you can only copy up to 2500 files at one time.
Although SharePoint can store 30 million documents per library, for optimum performance we recommend syncing no more than 300,000 files across all document libraries. Performance issues can occur if you have 300,000 items or more across all libraries that you are syncing, even if you are not syncing all items within those libraries.
Notes
If you are uploading, downloading, or moving a large number of files at once, you may need to wait an extended period of time before the sync process can complete. The desktop app showing “syncing” icon or displaying "processing changes" during this period is not necessarily an indication of a problem. You can always click the OneDrive taskbar icon to see the status of content that is in the process of syncing. To help reduce sync times, we recommend reviewing and possibly modifying your bandwidth settings before starting your upload or download. You can also read how to Choose which OneDrive folders to sync to your computer.
There are other SharePoint limits on viewing a document library using the web that may affect how you structure your files in OneDrive.
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