So we used to use rsync.net at my last job and it worked pretty well, so I'm biting the bullet and deciding to pay for off-site backup again (vs schlepping a hard drive somewhere every week).
One of the things I loved about rsync.net is that you just get ssh access to a big file system... you can get files onto it any way you want if it can be done by ssh/rsync. Apparently you can even run a few commands on their side (like git pull). This is my kind of service... no custom clients, etc. 👍
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