Modified from original to scan all AWS Regions, and allow wildcard to pull in all EC2's and associated snapshots for the EBS volumes

ec2-snapshots-full-inventory.ps1

#ec2-snapshots-full-inventory.ps1
#This will pull an inventory of all snapshots for all EBS volumes attached to an EC2 Instance.
#Can take wildcard to pull in all EC2 instances in all regions, or an EC2 Tag:NAME value to look for only one EC2 across all regions.
#Scans all AWS Regions.
# original from: https://matthewdavis111.com/powershell/ec2-latest-snapshots-of-attached-volumes/
#Altered to fit needs.
#Altered by: Ed Walsh
#Originally Modified: 01/20/2021
#Edited: 06/24/2021
#
# Instance Name is Case sensitive! Can also use a WildCard '*' to get all EC2's and associated EBS snapshots but it could take a long time for script to run!
#$InstanceName = 'EC2ServerName1'
$InstanceName = '*'
#

$timestamp = get-date -format yyyyMMddHHmmss
$subfolder = if (($PSVersionTable.PSEdition) -eq "Core") { if ( $True -eq $iswindows ) { "\Documents\" } Else { "" } } Else {"\Documents\"}
$mydocuments = $home + $subfolder 
$fileName = "EC2-"+ (&{If($InstanceName -eq '*') {"All-Instances"} Else {$instancename}}) +"-EBS-Volume-Snapshot-Inventory-"+ [string]$timestamp + ".csv"
$filePath = Join-Path $mydocuments $fileName

$o = @()
$out = @()

# Create an EC2 filter to find the instance with the corresponding Name tag (if you don't Name your instances, use another tag value)
$instanceFilter = New-Object Amazon.EC2.Model.Filter
$instanceFilter.Name = 'tag:Name'
$instanceFilter.Value = $InstanceName
$fullinstancefilter = "-filter $instanceFilter"
$regions = (Get-EC2Region).RegionName

foreach ($region in $regions) {
Write-Progress -Activity “Checking Region: $region”
$i = 0
$ec2IDs = (Get-EC2Instance -region $region -filter $instancefilter).Instances.InstanceID
$ec2countregion = $ec2ids | Measure-Object
$ec2count = ($ec2countregion).count

Foreach ($ec2id in $ec2ids) {
$i = $i + 1
Write-Progress -Activity “Checking Region: $region” -status “Scanning EC2 $i of $ec2count” -percentComplete ($i / $ec2count*100)
# Get EC2 instance volumeIDs
$volumeIDs = (Get-EC2Instance -region $region -InstanceId $ec2id).Instances.blockdevicemappings.ebs.volumeid
$ec2name = (Get-EC2Tag -Region $region -Filter @{Name="resource-type";Value="instance"},@{Name="resource-id";Value=$ec2id},@{Name="key";Value="Name"} | Select-Object @{Name="Name";Expression={$PSItem.Value}} ).name
# Get the latest snapshot for each volume
foreach ($volumeID in $volumeIDs) {
  $snapshotFilter = New-Object Amazon.EC2.Model.Filter
  $snapshotFilter.Name = 'volume-id'
  $snapshotFilter.value = $volumeID
  $snapshotId = Get-EC2Snapshot -Region $region -Filter $snapshotFilter #| Select-Object -First 1  #Uncomment if you only want the current snapshot and not all of them.
  

#Loop through to get each Snapshot taken for the volume.
  foreach ($sid in $snapshotid) {

  $o = New-Object -TypeName System.Management.Automation.PSObject -Property ([ordered]@{
            'Region' = $region;
            'Server' = $ec2name;
            'Instance-ID' = $ec2ID;
            'Snapshot-ID' = $sid.SnapshotId;
            'Time-Stamp' = $sid.StartTime;
            'Encrypted' = $sid.Encrypted;
            'Volume-ID' = $sid.VolumeId;
            'Volume-Size' = $sid.VolumeSize;
            'State' = $sid.State;
            'Description' = $sid.Description;
            
            })
    $out += $o
    }
}

}
}

$out |  Export-Csv -NoTypeInformation -Append -Path $filepath 

Write-Output "Exported to:  $filePath"
 Write-Output "\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\|||||||////////////////////////////////////"