Request: Optional monthly backups

[fiona]

Hi,

This example "mon *-1..7,15..21 15:00" does not work for me, I get an error message,

Parameter verification failed. (400)

schedule: invalid format - invalid calendar event 'mon *-1..7,15..21 15:00' - date specification not implemented at /usr/share/perl5/PVE/CalendarEvent.pm line 126.

please make sure you are running the latest updates:
https://pve.proxmox.com/wiki/Package_Repositories
https://pve.proxmox.com/pve-docs/chapter-sysadmin.html#system_software_updates