Can I delete data on my computer after transferring it to OneDrive?

Hi sedatdulkadiroğlu,

absolutely, you can remove data from your computer after transferring it to OneDrive.
Here are some key considerations:

• OneDrive mirrors your local files:
  OneDrive essentially syncs your local files with the corresponding OneDrive folder in the Microsoft cloud. Consequently, any modifications, including deletions, made on your computer will be reflected on OneDrive.

• Unlink your PC to stop synchronization:
  If you wish to cease this synchronization, you can unlink your PC from your OneDrive cloud in the Settings > Accounts section. After unlinking, you can manually update the cloud through a browser session on onedrive.com.

• Use 'Clear Space' for local removal:
  You can employ the 'Clear Space' feature to eliminate files from your computer without deleting them from OneDrive. To do this, open File Explorer, click on the OneDrive icon, right-click on any folder or file, and choose 'Clear Space'.

• Use 'Free Up Space' for cloud-only files:
  If you have enabled Files On-Demand, you can right-click on folders and files to make them cloud-only by selecting 'Free Up Space'.

Deleting files from PC without losing them on Onedrive - Microsoft Community