PS script to disable users / Audit and remove Groups / Hide from GAL have bits but need to put it together

Hi All

I am trying to get a script together to run against a specific OU (our disabled Users OU) to make the process of leavers more automated.

I am trying to achieve the 4 main outcomes below

1. Disable User account 

2. Hide from GAL

3. Export users group membership to a file based on SamAccountName

4. Remove users from all groups except domain users

I have some parts of this working from other peoples scripts i have found on the web but need to tie it all together which is proving to be beyond my basic scripting ability

Below is what i have so far, this does disable users / hide from GAL and remove groups however as stated i would really like it to export the group membership to a file before removing them so i have a record should a mistake be made.

$users= get-aduser -Filter {(Enabled -eq "True")} -SearchBase "ou=Disabled Accounts,dc=test2k8,dc=local"

Function RemoveMemberships

 {

 param([string]$SAMAccountName)  
 
 $user = Get-ADUser $SAMAccountName -properties memberof
 
 $userGroups = $user.memberof

 $userGroups | %{get-adgroup $_ | Remove-ADGroupMember -confirm:$false -member $SAMAccountName}

 $userGroups = $null

 }


$users | %{RemoveMemberships $_.SAMAccountName}




ForEach ($user in $users) 
    {
set-aduser -identity $user.sAMAccountName -Enabled $false -replace @{msExchHideFromAddressLists=$true}
}

exit

If there is anyone here that can help i would be very grateful

Many Thanks

Nick