This backup package requires PHP 7, since v5.6 it requires PHP 7.1 or higher with the ZIP module and Laravel 5.5 or higher. It's not compatible with Windows servers.
If you are using an older version of Laravel, v3 and v4 of Laravel Backup support Laravel 5.1.20 up.
The package needs free disk space where it can create backups. Ensure that you have at least as much free space as the total size of the files you want to backup.
Make sure mysqldump is installed on your system if you want to backup MySQL databases.
Make sure pg_dump is installed on your system if you want to backup PostgreSQL databases.
Make sure mongodump is installed on your system if you want to backup Mongo databases.
To send notifications to Slack you'll need to install guzzlehttp/guzzle v6:
composer require guzzlehttp/guzzle