Sync files with the OneDrive sync client on Mac OS X
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When you install the OneDrive app for Mac, a copy of your OneDrive is downloaded to your Mac and put in the OneDrive folder. This folder is kept in sync with OneDrive. If you add, change, or delete a file or folder on the OneDrive website, the file or folder is added, changed, or deleted in your OneDrive folder and vice versa.
To upload files to OneDrive automatically, just copy or move the files to your OneDrive folder using the Finder, or save them in your OneDrive folder from an app. Files you upload this way can be up to 15GB in size if you're signed in to a Microsoft account, or 15GB if you're signed in to a work or school account. If you installed the OneDrive app on other computers, the files will automatically be added to the OneDrive folders on them, too.
You can also use the Finder to rename and delete files, create new folders, and move files around in your OneDrive folder. The changes will automatically be made in OneDrive and your other computers that have the OneDrive app installed.
The OneDrive sync client lets you sync files from your OneDrive for Business and even from SharePoint sites if your admin enabled it. (If you're the IT admin for your organization, see Enable users to sync SharePoint files with the new OneDrive sync client.)
Note: To use the OneDrive desktop app to sync your work files, you need an Office 365 business account.
Note: As of 1 February 2019, OneDrive only supports new installations on Mac OS 10.12 or newer.