I am creating a PHP based web application using Amazon's S3 and glacier services.
Now I want to give my site users a feature that they can choose any file and make it archive (means move file from S3 to Glacier) and unarchive (means move file from Glacier to S3).
I have done some research and didn't find any possible way using Amazon's API.
PROBLEM
How can I move files between S3 and glacier using API?
Lifecycle rules. Currently, there is no way of uploading objects directly to S3 Glacier using a Snowball Edge. Thus, you first have to upload your objects into S3 Standard, and then use S3 lifecycle policies to transition the files to S3 Glacier.
However, you cannot download archives from S3 Glacier by using the management console. To download data, such as photos, videos, and other documents, you must either use the AWS Command Line Interface (AWS CLI) or write code to make requests, by using either the REST API directly or by using the AWS SDKs.
You could use the Glacier API to upload a file to a Glacier vault, but I don't recommend it. The previous version of our backup app did that. When you upload a file it gets a randomly-assigned name. You can add put your filename in the metadata of the file, but if you want a list of what's in the Glacier vault you have to query and then wait 3-5 hours for the list.
Lifecycle policies are the other way to use Glacier. The current version of Arq uses them because each object still looks like an S3 object (no random object names, no delays in getting object lists), but the object contents are in Glacier storage. The only difference is that getting the object contents is a 2-step process: you have to make an API call to request that the object be made downloadable; when it's ready, you can download it. Also there's a "peak hourly request fee" that comes into play if you request objects be made downloadable at too fast a rate. Amazon Glacier pricing is complex.
Once an object is "Glacier storage class" there's no way to change it back to "Standard storage class". You have to make a copy of the object that's "Standard storage class" and delete the Glacier object.
So maybe a simple solution to your problem is:
You can use the API to define lifecycle rules that archive files from Amazon S3 to Amazon Glacier and you can use the API to retrieve a temporary copy of files archived to Glacier. However, you cannot use the API to tell Amazon S3 to move specific files into Glacier.
There are two ways to use Amazon Glacier:
Connecting directly via the Glacier API allows you to store archives for long-term storage, often used as a replacement for Tape. Data stored via the Glacier API must also be retrieved via the Glacier API. This is typically done with normal enterprise backup software or even light-weight products such as Cloudberry Backup (Windows) or Arq (Mac).
Using Amazon S3 lifecycle rules allows you to store data in Amazon S3, then define rules that determine when data should be archived to Glacier for long-term storage. For example, data could be archived 90 days after creation. The data transfer is governed by the lifecycle rules, which operate on a daily batch basis. The rules can be set via the putBucketLifecycle API call (available in the PHP SDK), but this only defines the rules -- it is not possible to make an API call that tells S3 to archive specific files to Glacier.
Amazon S3 has a RestoreObject API call (available in the PHP SDK) to restore a temporary copy of data archived from Glacier back into S3. Please note that restoring data from Glacier takes 3-5 hours.
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