If you’re in the Apple ecosystem, you can toss your vault into iCloud Drive. If you’re technically proficient (and brave) you can write a cron to sync into whichever service you want via a local machine.
In addition to iCloud, I have a one-way sync (rsync) which functions as a poor man’s backup to get all my files into Dropbox; lots of stern warnings from Obsidian not to use Dropbox.