I don't atm.. Soon Right now I just handle support via PM, email or text/calling my cell. I have several million post boards that have had no issue handling it this way. I sold my company last year, but all of my big customers all contacted me and only wanted me to host them even after the sale.. Several even said I would be the only person they'd ever trust to host them.. So for now I just been doing a custom quote per site needs sort of thing.
If you have a panel (cPanel for example), you can do internal backups by yourself (but it would take you disk space). The best practice is doing backups in a different distention - daily. For example: https://backupsy.com/index.php
You can get 250GB for $5/month or 500GB for $7/month. Having backups on the same server is nice, but it's not a good practice. It takes only one time to understand this, then you will learn not to rely on same-server/distention backups.
Nimbus's backups are stored off-site. I.e. they store them in a different country, to ensure that if something would go terribly wrong (Scots invading London and making Haggis out of the servers at the data center), the backups can be used to get you up and running again in no time.