For Crashplan an Backblaze, you are using their specific client, so if it doesn't suit your needs (retention schedules, file include/exclude control, multi tier

For Crashplan an Backblaze, you are using their specific client, so if it doesn't suit your needs (retention schedules, file include/exclude control, multi tiered backups, special [i.e., database] file handling) you are out of luck. So the ideal use of Glacier is to use a backup client that fits your needs, with S3/Glacier support built in. Or use an online backup provider that uses S3/Glacier as a backend to their product.