Wait a minute, is Amazon truly UNLIMITED? Even for encrypted files from ARQ? Mine currently is going to OneDrive, but that's limited to 1TB for $7 a month which includes office 365. There has not be some catch with Amazon here.
Yeah amazon cloud drive is pretty popular on /r/DataHoarder/, quite a few people have 10TB+ on it, some even a lot more.
Personally I have close to 7TB of backups and personal video footage stored, everything encrypted, never had any issues.
However there's always the danger of them pulling a onedrive at some point in the future and reverting from unlimited back to something like 1TB if people actually use it.
There are people on that subreddit who have a lot more than 10TB and even someone recently who uploaded more than 1PB. Even considering Amazon's above average capability to store large amounts of data, I'm surprised that the individual hasn't had their account suspended.
Have 2tb of mostly photos and home videos on Amazon cloud drive. Unencrypted. No issues, I heard of people with 3-4 times as much and not having issues. I assume these services have users with much less than 1tb with a fee outliers who use a lot of space making the unlimited service feasible as a marketing feature.
It's unlimited yes, but ACD will cut you off if you start downloading a lot, I recall someone on /r/DateHoarder complaining that they wanted to restore their NAS and ACD Support was blocking any requests towards lifting the block.
I would like to use borg backup, but it isn't as flexible as arq.