after install update to MIKOPBX ver: 2021.3.86, problems with backup

Question

Hello, after updating the Miko to 2021.3.86 i have the following problem.

A backup can be created manually, this is ok.
Unfortunately, this does not work with the automatic function via ftp upload.

Only 4 files are created on the ftp.

config.json

error.txt (empty)

flist.txt (empty)

progress.txt

in config.json
{"backup-config": "1", "backup-cdr": "1", "backup-records": "1", "backup-sound-files": "1", "backup": "\ / storage \ /hosting*******.netcup.net.21 "," type ":" zip "}

in progress.txt
0/0

I have also already uninstalled the module, reinstalled it ... unfortunately the problem persists. I also installed a completely new Miko for testing, same problem