# Randomize Veeam Backups, a Veeam PowerShell script
# This script will add randomness to Veeam backup jobs by configuring them to use different periodic backup intervals
# Run this on a Veeam Backup and Replication version 8 update 1 server
# You could even copy and paste it into Veeam Backup and Replication > Menu > PowerShell
# Written by Jason Pearce of www.jasonpearce.com in March 2015
# Use at your own risk, freely share, and comment on improvements

# BEGIN Random variables #####################

# RandomFullPeriod: Variable for Schedule > Run the job automatically > Periodically every XXX minutes. Must be a value between 0 and 999.
# Key: 1-8 hours 1h=60min, 2h=120min, 3h=180min, 4h=240min, 5h=300min, 6h=360min, 7h=420min, 8h=480min
# Key: 9-16 hours 9h=540min, 10h=600min, 11h=660min, 12h=720min, 13h=780min, 14h=840min, 15h=900min, 16h=960min
$RandomFullPeriodMinimum = 780
$RandomFullPeriodMaximum = 960

# RandomHourlyOffset: Variable for Schedule > Run the job automatically > Periodically every > Schedule > Start time within an hour. Must be a value between 0 and 59.
$RandomHourlyOffsetMinimum = 0
$RandomHourlyOffsetMaximum = 59

# RandomRetryTimeout: Variable for Schedule > Automatic Retry > Wait before each retry attempt for. Must be a value between 0 and 59.
$RandomRetryTimeoutMinimum = 10
$RandomRetryTimeoutMaximum = 50

# RandomNextRun: Next Run is calculated from LatestRun (delayed calculation). This will randomly stagger when your backups will next run.
$RandomNextRunMinimum = 5
$RandomNextRunMaximum = 500
$RandomLatestRunMinimum = 5
$RandomLatestRunMaximum = 500

# END Random variables #######################

# BEGIN Other variables ######################

# BackupRetention: Variables for RetainDays (amount of restore points) and RetainCycles (amount of days for Deleted VMs retention period).
$RetainDays = 14
$RetainCycles = 14

# Get All, Some, or One backup jobs.
# You MUST uncomment and modify one of these lines to target one or more backup jobs.
# Only one line should begin with "$jobs =". These are just four helpful examples.
#By-All# $jobs = Get-VBRJob | Where-Object { $_.IsBackup -eq $true }
#By-PREFIX# $jobs = Get-VBRJob -Name "Test-*" | Where-Object { $_.IsBackup -eq $true }
#By-LIST# $jobs = Get-VBRJob -Name "Test-1","Test-2" | Where-Object { $_.IsBackup -eq $true }
#By-NAME# $jobs = Get-VBRJob -Name "Test-Job" | Where-Object { $_.IsBackup -eq $true }

# END Other variables ########################

# BEGIN foreach loop #########################

# Make the following changes to all backup jobs
foreach ($job in $jobs) {

	# BEGIN Job Options ######################

		# Read current job settings
		$jobOptions = Get-VBRJobOptions -Job $job

		# Set more Job Advanced Storage Options 
		$jobOptions.BackupStorageOptions.RetainCycles = $RetainCycles
		$jobOptions.BackupStorageOptions.RetainDays = $RetainDays

		# Apply these additional Backup Mode settings
		$jobOptions = Set-VBRJobOptions -Job $job -Options $jobOptions

	# END Job Options ########################

	# BEGIN Job Schedule Options #############

		# Create a new job schedule 
		$jobScheduleOptions = New-VBRJobScheduleOptions

		# Generate random number for FullPeriod (Minimum and Maximum variables are defined above)
		$RandomFullPeriod = Get-Random -Minimum $RandomFullPeriodMinimum -Maximum $RandomFullPeriodMaximum

		# Create a random FullPeriod offset
		$jobScheduleOptions.OptionsPeriodically.FullPeriod = $RandomFullPeriod

		# Generate random number for HourlyOffset (Minimum and Maximum variables are defined above)
		$RandomHourlyOffset = Get-Random -Minimum $RandomHourlyOffsetMinimum -Maximum $RandomHourlyOffsetMaximum

		# Create a random HourlyOffset
		$jobScheduleOptions.OptionsPeriodically.HourlyOffset = $RandomHourlyOffset

		# Generate random number for RetryTimeout (Minimum and Maximum variables are defined above)
		$RandomRetryTimeout = Get-Random -Minimum $RandomRetryTimeoutMinimum -Maximum $RandomRetryTimeoutMaximum

		# Create a random RetryTimeout
		$jobScheduleOptions.RetryTimeout = $RandomRetryTimeout

		# Generate random number for NextRun (Minimum and Maximum variables are defined above)
		$RandomNextRun = Get-Random -Minimum $RandomNextRunMinimum -Maximum $RandomNextRunMaximum

		# Create a random NextRun (future)
		$jobScheduleOptions.NextRun = (Get-Date).AddMinutes($RandomNextRun)

		# Generate random number for LatestRun (Minimum and Maximum variables are defined above)
		$RandomLatestRun = Get-Random -Minimum $RandomLatestRunMinimum -Maximum $RandomLatestRunMaximum

		# Create a random LatestRun (past)
		$jobScheduleOptions.LatestRun = (Get-Date).AddMinutes(-($RandomLatestRun))

		# Enable Periodically Schedule
		$jobScheduleOptions.OptionsPeriodically.Enabled = $true

		# Configure Periodic Schedule in Minutes (0 = Hours, 1 = Minutes)
		$jobScheduleOptions.OptionsPeriodically.Kind = 1

		# Disable Daily Schedule
		$jobScheduleOptions.OptionsDaily.Enabled = $false

		# Disable Monthly Schedule
		$jobScheduleOptions.OptionsMonthly.Enabled = $false

		# Disable Continuous Schedule
		$jobScheduleOptions.OptionsContinuous.Enabled = $false

		# Apply the new job schedule
		Set-VBRJobScheduleOptions -Job $job -Options $jobScheduleOptions

	# END Job Schedule Options ###############

	# Report which jobs received these changes
	Write-Host "Changed settings for" $job.Name
}
# END foreach loop ###########################