backing up a blog

There are hundreds and hundreds of ways to do that…

[ Moderator note: link fixed, careful with that link button. ]

Plugins:
I recommend BackupWP: https://www.ads-software.com/plugins/backwpup/

Manual:
I recommend basic understanding of mysql and wordpress (not necessarily php). Plenty of tutorials online. In fact, give me a moment and I will write one right now and send you the link.

Actually, this old lady already made a video, here you go:

Great thanks