MyBB Central

Not sure this is the right place to post..
Hi all.. im very new..a few days into my first forum.. I wanted to ask how often should one back up and should files be downloaded or saved?,, also.. when you do back ups.. do I ever need to delete old back ups after?

Minimal monthly...optimal is daily but weekly is common.

Thank you..

Oh and immediately before and after doing substantial work (upgrades or layout changes).