My preferred backup solution is PersonalBackup.
With this tool I do all the versioning and syncing to external drives or SFTP Servers.
In addition to that I sync to cloud storages with the respective client apps.
For local backups (means not online) I keep several versions.
As I do not have excessive space online, my online backups are just mirrors.
For the cloud storage I use cryptomator as encryption. Which means I have a vault (X:) in my sync location (eg C:\OneDrive), and I mirror my workfolder (eg C:\Documents) into that vault (X:).
Yes, that consumes a lot of local space. This is why I do only mirror backups when it comes to online storages.
I have to admit that I’m a little “paranoid” when it comes to data loss, so I have a lot of backups which multiple the amount of space I actually would need just for working.
To be honest: If I have an images with 3 MB size, I need up to additional 21 MB space for backups (1 version in the vault for OneDrive, 1 Version in an other vault stored on my FTP and 5 Versions on my external harddrive).
I now its too much, but I never lost a file in the last 15 years, despite I had several major incidents with my hardware. 
Here’s a link where I have explained the PersonalBackup setup in more detail.
(PS: PersonalBackup 6 comes with a hot-folder monitoring & backup)