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Glacier Storage/Cold storage, which usually takes ~6h to retrieve files, on Cloud providers are really cheap (I know Azure has $0.99/TB/month), but I have a hard time finding any free backup solutions to support the very-high latency natively.

I remember reading a long time ago that Restic was not going to natively support cold storage solutions. Has anything changed?

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You should not backup directly to Glacier, you should backup to S3 and move from S3 to Glacier by retention policy configured for an S3 bucket.

And when I have to do incremental backups or retrieve a single file, do I have to move the whole backup from cold storage, and then back again?

I did not understand "back again" part. Glacier allows you to retrieve individual files.

You should not do this, because getting your data back out of Glacier will be painful. You cannot use S3 tools to restore data from Glacier. Author of Hashbackup, and I've implemented and then depreciated Glacier support because it is very difficult for anything other than WORM-type backups.

It's not painful, it's the way this specific product works.

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