ncp-restore:"tar: Unexpected EOF in archive" restore backup not possible NextcloudPi

Hi there,

i set up an new ncpi and want to restore my former data and files.
Unfortunately it is not possible. I set up the new ncp, ran apt-update and apt-upgrade (following this instruction: https://help.nextcloud.com/t/how-to-restore-nextcloudpi-backup-using-web-panel/126312)
And this is what happens:

[ nc-restore ] (Mon Oct 24 06:57:38 BST 2022)
check free space...
tar: Unexpected EOF in archive
tar: Error is not recoverable: exiting now
extracting backup file /media/backup/nextcloud-bkp_20221022_1666404010.tar...

I also tried to restore using ncp-config.

Can you help me?

Thanks

Edit 1:
This appears after a while:

[ nc-restore ] (Mon Oct 24 06:57:38 BST 2022)
check free space...
tar: Unexpected EOF in archive
tar: Error is not recoverable: exiting now
extracting backup file /media/backup/nextcloud-bkp_20221022_1666404010.tar...
tar: Unexpected EOF in archive
tar: rmtlseek not stopped at a record boundary
tar: Error is not recoverable: exiting now
Cleanup...

Start with the ncp-restore and ncp-config entry points and reproduce the failure using /media/backup/nextcloud-bkp_20221022_1666404010.tar. Check the tar extraction and cleanup path around the reported Unexpected EOF; done means a valid backup restores successfully without the extraction errors.