Backing up WHM & Directory Question

I have backups enabled to run nightly and sent offsite to Backblaze so my customer accounts are safe and stored elsewhere. If something happens to my server, can I:

• backup the whm through WHM Backups?
• what kind of file(s) does it create
• lastly, how is it restored?

I'm asking because my current process would be to 1) reinstall os, 2)reinstall whm, 3)restore all the separate accounts one by one.