It can varies a lot from VPS hosts to hosts. This can be a little confusing because unfortunately many hosting providers differ in their definition of “managed hosting”, and some providers have “semi-managed hosting”. So if you’ve determined that you need a managed VPS (which is positively the way to go if you are not comfortable with running a Linux server), you must contact your potential VPS service providers for the details or look at the specific tasks that your managed provider will and will not perform.
WHM's Backup Configuration section is one of the most powerful and vital tools for an administrator of multiple sites. It allows you to manage each of your individual cPanel backups separately, giving you the choice of backup cadence (daily, weekly, monthly and manually) and location. Preserving your clients business-critical files, data and site content is of the utmost importance. Work with your clients on implementing a backup schedule and location that is appropriate for their site(s) and make sure they have the peace of mind that their data and site material are safe.
Unmetered hosting is generally offered with no limit on the amount of data-transferred on a fixed bandwidth line. Usually, unmetered hosting is offered with 10 Mbit/s, 100 Mbit/s or 1000 Mbit/s (with some as high as 10Gbit/s). This means that the customer is theoretically able to use ~3 TB on 10 Mbit/s or up to ~300 TB on a 1000 Mbit/s line per month, although in practice the values will be significantly less. In a virtual private server, this will be shared bandwidth and a fair usage policy should be involved. Unlimited hosting is also commonly marketed but generally limited by acceptable usage policies and terms of service. Offers of unlimited disk space and bandwidth are always false due to cost, carrier capacities and technological boundaries.