Question Best strategies and tools for VPS backup

[CobraArbok]

I want to test for the complete recovery of the server.

I have an Ubuntu 18.04 LTS VPS, with Plesk Onyx (Latest release).
In this simulation I want to do a complete backup and restore on a second VPS where I will install Ubuntu 18.04 without Plesk.
There are no problems with the Plesk license because in any case I also have a license for the second VPS.

I have then also:

• an access on an FTP / SFTP space
• a Dropbox access
• an additional Ubuntu 18.04 LTS server to be used for storage and where, if necessary, I can install FreeNAS.

What are the best strategies to recommend and with what tools (in Plesk and not).

Thanks in advance.