After update to High Sierra all my files deleted

Restore specific items from a Time Machine backup

1. Open a window for the item that you want to restore.
   For example:
   • To restore a file you accidentally deleted from your Documents folder, open the Documents folder.
   • To restore an email message, open your inbox in Mail.
   • If you're using an app that automatically saves versions of documents as you work on them, you can open a document, then use Time Machine to restore earlier versions of that document.
2. Choose Enter Time Machine from the Time Machine menu , or click Time Machine in the Dock. This example shows Time Machine for the Documents folder:
   
3. Find the items to restore:
   • Use the timeline on the edge of the screen to see the items in your Time Machine backup as they were at that date and time. The timeline may also include local snapshots.
   • Use the onscreen up and down arrows to jump to the last time the contents of the window changed. You can also use the search field in a window to find an item, then move through time while focused on changes to that item.
   • Select an item and press Space Bar to preview it and make sure it's the one you want.
4. Click Restore to restore the selected item, or Control-click the item for other options.

Restore everything from a Time Machine backup

To completely restore your Mac, use the “Restore from Time Machine Backup” utility in macOS Recovery. The disk you're restoring is erased before receiving the macOS and other contents of your Time Machine backup.

To copy just your files, settings, or user accounts, use Migration Assistant.

Go to System Preferences > iCloud > iCloud Drive

Select Options

Check to see if you have Desktop & Documents Folders checked. If yes, you should see your Desktop and Documents folder under iCloud in the Sidebar.

Uncheck to turn off.

When you turn off Desktop and Documents, your files stay in iCloud Drive and a new folder is created on your Mac. You can move files from iCloud Drive to your Mac as you need them, or select all of your files and drag them to the place you want to keep them.

1 From your Mac, go to Apple menu  > System Preferences > iCloud.

2 Next to iCloud Drive, click Options.

3 Deselect Desktop & Documents Folders.

4 Click Done.

This didn't work for me.

Unless you have a backup, it sounds like your files were deleted.

Can you explain exactly what you mean?

If the item in the Sidebar named "All My Files" is gone, that doesn't mean all of your files are deleted.