You may not expect my answers. Backup is actually not the issue. It is RESTORE after a disaster, such as a drive stops working completely.
To do a complete Restore over the Internet could easily take THREE DAYS or longer. In addition, a minor change in that company's policy or the company going out of business or attacked by hackers could leave your Backups unavailable to you. None of those are acceptable to me.
If you want so save some subset of all your files, (for example your pictures) using an online backup service, that seems fine -- as long as that is not the ONLY Backup you have.
My suggested alternative:
For under US$100, you can have a large, slow external drive right on your desk. Time Machine (built into MacOS) can be making incremental backups in the background at low priority, while you continue to do your regular work. Or you can use a stand-alone backup program like CarbonCopyCloner, SuperDuper, or ChronoSync and do it manually or on a schedule of your choosing.
You can leave your drive encrypted and have Zero issues with encryption while making either an encrypted or an unencrypted backup to a an external drive. In addition, local backups of MacOS format drives does not tie up your Internet connection because these online Backup companies are too stupid (read: do not care about Macs or you) to use the tools inside MacOS to stop reading every file to make one incremental Backup.