Simple Powershell Script to take backup of all site collections in all webapplications in a farm

$webapps = Get-SPWebApplication
foreach($app in $webapps)
{
    $siteCollections = $app.Sites
  
    foreach($sc in $siteCollections)
    {
        $loc="c:\Backups_sitecolls\"+$sc.Url.Substring(7).Replace(':','')+".bak";
        $loc=$loc.Replace('/','_');
        "backing up " + $sc.Url
        Backup-SPSite -Identity $sc.Url -Path $loc -Confirm -Force -NoSiteLock
      
    }
}
This script clears the http:// section of url and replaces and replaces / with _ in the file name of site collection.
This needs a folder "c:\Backups_sitecolls\".
Replace : before port number with empty character.