The synchronization depends on the number and size of the files to synchronize. Also the speed of your Internet connection and the load of the SWITCHdrive-Servers are factors that can slow down synchronization.
Such an error message indicates that you are probably using an out of date desktop client for SWITCHdrive. Please go to the SWITCHdrive web page https://help.switch.ch/drive/downloads/ and install the latest desktop client.
Make sure that the the name of the folder you synchronise with SWITCHdrive is exactly spelled the same way as in the SWITCHdrive settings. Capitalisation is crucial: SWITCHdrive is not the same as switchdrive.
If your switchdrive folder is spelled differently, please rename the folder to match the naming in the SWITCHdrive settings. After that quit your SWITCHdrive client and restart it again.
If you've deleted a file you can retrieve it through the webclient of SWITCHdrive. Click "Deleted files" in the lower left corner (1). Select the files or folders you would like to restore and press "Restore" (2). If you want to permanently delete the files or folders click on the trash bin (3).
All files and folders you delete are saved for a certain amount of time, so you are able to restore them if required. If you would like to permanently delete a file or folder, go to the webclient of SWITCHdrive. Click on the "Deleted files" in the lower left corner. Select the file or folder you would like to permanently remove and click on the trash bin icon. Please note: permanently deleted files or folder cannot be restored, so be very cautious when you decide to permanently delete a file or folder.
This might come in handy if you have folders with a lot of (large) files, such as "Movies" or "Backup". You might not want to sync these files to every computer you have. To prevent SWITCHdrive from doing this, go to your SWITCHdrive settings (right-click on the SWICHdrive symbol ) and select "Settings" from the pop up menu.
In the main-tab on the left you can uncheck the folders that should not be synced to your computer. The files are NOT deleted, they are just not synchronized to your computer.