Hello, I want to set up a backup system that will automatically upload all the data from my Google Drive to Nextcloud every month. I want to ensure that the data from the previous months is not lost or overwritten, and it would be preferable if the backups are in ZIP format. How can I achieve this? Are there any recommended tools or automated solutions for this task?
@Ashot_Zaqoyan welcome to the community
you could do that with a third party application like rclone
but there is no Nextcloud app that’ll take care of that for you. maybe Google can give you advice on scripting takeout and syncing via WebDav to your Nextcloud instance.
this is a Nextcloud forum, its doubtful you’ll find Google support here 
Nextcloud is not a backup software. It is maybe a Google Drive alternative. For backup use another software or ask Google for a backup service.