ict-1025
The goal of this MR is to add checks relevant from ICT-1025.
The main check is that this confirms that the backup disk contains enough space to hold and restore backups of the accounts currently on the system.
Math for this is (sum_of_all_accounts_disk_usage + MySQLData + largestAccount) < space_on_backup_disk
In order to get a "GOOD" response, the backup disk must have sufficient capacity for all accounts + mysqldata + largest account. The reasoning for the largest account being added on top is because cPanel requires that much space free (largest account's worth) in order to restore it.