You get 7 free snapshots that do not count against your quota.

Additional snapshots are charged based on the byte diffs, not total size.

It uses a standard protocol and anything that uses ssh can conceivably communicate with it.

Oh, and you are not charged for transfer.

Say I generate logs at say 1 GB/hr and store them in files named `logs.$(date +%Y%m%dT%H)` and I have it set up to take snapshots every 4 hours and delete files older than 5 hours, then I could have essentially unlimited storage and only ever pay for 5 GB/month?

This is the big one. Even for backblaze b2, it's the transfer that means 2-3tb data doesn't make sense on a personal budget (eg digital negatives and a few 4k videos). A restore become (too) expensive.