There are limitations to using OneDrive for Business to synchronize items.
| Maximum items* for OneDrive for Business | 20 000 |
| Maximum items* per Sharepoint document library | 5 000** |
* Files and folders.
** You can synchronize more than one library.
| Maximum size per item | 2 GB |
| Maximum name length for files and folders | Sharepoint Server 2013: max. 128 chars Sharepoint Online: max. 256 chars Folder names: max. 250 chars Maximum combined names (files and folders, aka "path": max. 250 chars |
| Invalid characters: | \ / : * ? " < > | &hash; spaces are not supported files starting with a ~ |
| Invalid chars (Sharepoint Server 2013): | All of the above + { } % ~ names starting with a . |
| Unsupported folder names: | forms at the top-level, or names starting with _vti_ |
| Unsupported file names: | GUID-names are not supported (e.g. {9b6634a7-26b7-40a2-a48e-6f967d89c29e} |
| Invalid file types (extensions) | *.tmp .DS_Store desktop.ini thumbs.db ehtthumbs.db all types blocked by your site administrator. |
| OneNote notes | OneNote resources cannot be synced through OneDrive for Business, as they use their own mechanism for synchronizing contents. |
Additionally, files locked (read or read/write locks) cannot be synced until the lock is released (i.e. files are closed).
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