How many user accounts do you need to create? Generally speaking, you'd have one user account per customer. Sometimes more if you need to manage backups at that customer a little differently per account.

This is backup accounts for users within a company, such as can be created individually at https://mbs.cloudberrylab.com/AP/AddUser.aspx . In this instance, I'm creating 10 within the same company, which isn't too difficult. But for future use, I'm wondering if there's some kind of CSV import facility, like for example, when you bulk-create G-Suite accounts.

I get that you'd generally have one user account per customer. But I would never use a single user account to cover a whole company as that would allow every user to access every other user's backup.

My question is whether it's possible to create those user accounts in bulk, from a file that you've prepared in advance (e.g. excel/CSV/etc.). Or, do you need to create them one-by-one at https://mbs.cloudberrylab.com/AP/AddUser.aspx .

The only way to do what you want I would be through using the API. You can refer to API information in the help section of Managed Backup. https://mspbackups.com/AP/Help/mbs-api-specification/methods/post-apiusers