Backup strategy

I have a question regarding the backup of MiaB - I had a bit of data loss the last couple of days (All calendar entries for one user (me) gone) and am now not sure about backups — there is a daily backup that I can access via the web front end. There also seems to be a backup of owncloud every time I do an upgrade - this means about once a quarter. Is this correct? Does this mean that I only backup contacts and calendar every three months? I would love a bit of clarity :blush:

Thank you very much and keep up the good work - love MiaB :+1: