I use rsync.net. You can use basically any SSH tool or rclone interface. They have a cheaper plan for "experts" if you want to forgo zfs snapshots,https://www.rsync.net/signup/order.html?code=experts.
Rsync.net is really really good.
Just this weekend, my backup tool went rogue and exhausted quota on rsync.net (Some bad config by me on Borg.) Emailed them, they promptly added 100 GB storage for a day so that I could recover the situation. Plus, their product has been rock solid since a few years I've been using them.
Thanks for your kind words.
Just to clarify - there are discounted plans that don't have free ZFS snapshots but you can still have them ... they just count towards your quota.
If your files don't change much - you don't have much "churn" - they might not take up any real space anyway.
rsync.net and rclone are great, my brain understood restic easier than borg for local backups over usb (ymmv), and plain old `rsync --archive` is most excellent wrt preserving file mod times and the like.
There is 100% a difference between "dead data" (eg: movie.mp4) and "live data" (eg: a git directory with `chmod` attributes)- S3 and similar often don't preserve "attributes and metadata" without a special secondary pass, even though the `md5` might be the same.
Just a note of caution: sync != backup. When I was younger and dumber, I had my own rsync cron script to do a nightly sync of my documents to a remote server. One day I noticed files were gone from my local drive; I think there were block corruptions on the disk itself, and the files were dropped from the filesystem, or something like that. The nightly rsync propagated the deletions to the remote "backup."
D'argh.