How to make a remote machine make server backups?

Question

Backup

In short, I serve several clients.
For many, backups, at best, are done on an external railway and by hand. Those. Everything is bad.
The question is, is there software that will itself connect to the specified machine at the specified time and copy the necessary data (for example, somewhere you just need to copy the files, somewhere the mssql database, and where to pick up the entire OS image)?

Answer 1

as an option: https://ru.wikipedia.org/wiki/Bacula

Answer 2

I may be misunderstanding the problem, but I don't see any problems.
1. Run the script during X
2. The script executes another script on the remote server - it creates a task (on the remote server) for "in 5 minutes".
3. The task starts the backuper with the keys. After the backup starts copying the backup file to the resource you need.
Everything, you can kill the task and the script.