Since last Monday no backup of my Yunohost server does exist. Borg is no longer running. You can restart Borg but it will get killed again.
There is also a Github issue filed by another user Failed to start Run backup borg · Issue #95 · YunoHost-Apps/borg_ynh · GitHub but nevertheless I think I should post it here as well as this concerns a central fuction that is no longer working. It seems it happened after the last borg backup update: At the end of the backup process borg gets killed and cannot start again. Result: no backup!