Archive for May, 2010

S3 storage now 33% cheaper!


May 20th, 2010

Great news!

Amazon just announced “Reduced Redundancy Storage” (RRS) for S3. Objects stored with the RRS “storage class” are “99.99% durable over a given year,” whereas “standard” storage is 99.999999999% durable (overkill for backup for most people). Objects stored with RRS are only $.10/GB per month ($.11 in the Northern California region — see pricing) — a 33% savings!

Arq with RRS Support

Arq 1.4 is out with support for RRS! Pick “Check for Updates” in the Arq menu to automatically update, or download it from the Arq product page.

For new users of Arq the default is to use RRS. For current users Arq continues to use Standard storage (I didn’t want to assume everyone would want to make the switch).

Migrating to RRS

If you’re a current user, just install the update as described above, then go to the Budget tab of Preferences and check “Use Reduced Redundancy storage class for new objects”:

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If you want to convert your existing S3 objects to RRS, click the button “Update Storage Class of Existing Objects.” Arq will determine which storage class each object is in:

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Click “Convert” to migrate:

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Enjoy the savings!

- Stefan

Quick survey to make Arq even better


May 15th, 2010

If you’re an Arq user, I’d really like to get your feedback on Arq and find out what else you’d like it to do for you.

Could you please take this 5-question survey?

Fill out as much or as little as you’d like. I’ll share the response summary (minus those who don’t want their responses made public).

– Stefan

False alarm, and Arq 1.3.15


May 13th, 2010

Sorry about that last blog post folks.

False Alarm

Turns out Arq 1.3.14 works fine. A customer had reported that his backups were gone right after he updated, and I thought I reproduced the problem, but it turns out I didn’t reproduce the problem, and furthermore it wasn’t actually a problem!

The customer had pushed the “Change Region” button in the Advanced section of the Preferences, and had chosen a different S3 region. When you choose a different region, Arq actually has to create a different S3 “bucket” (you can’t move an S3 bucket from one region to another). Arq doesn’t copy the configuration and data to the new bucket. It even says so on the “Change Region” dialog:

Screen shot 2010-05-13 at 4.10.07 PM.png

After a lot of emails back and forth I finally figured out that’s what happened. He neglected to mention that he had changed his S3 region.

My initial reaction was that this was a data-loss bug, and others should be warned so that others can avoid data loss. I’m not sure if I reacted correctly in this situation, and I apologize for the false alarm. I guess I need to relax and get all the facts before announcing to everybody that there’s a problem!

Arq 1.3.15

Another customer did uncover a legitimate bug however: in “30-day trial” mode, Arq acted as if the trial was expired, whether it was past 30 days or not.

Arq 1.3.15 fixes that bug.

Pick “Check for Updates” from the Arq menu to automatically update to 1.3.15, or download it from the web.

Arq 1.3.14 problem


May 13th, 2010

[UPDATE: Ignore this post. It was a false alarm. See the following post for details.]

The version of Arq that I just shipped has a bug which may cause it to drop old backup versions.

To everyone who already downloaded it, I sincerely apologize, and I’m working nonstop to fix it. I recommend you re-install version 1.3.11 by downloading it from here:

You’ll need to stop Arq and Arq Agent, unzip the zip file and overwrite your

I reverted the main download link on the web site to point to 1.3.11 for the time being.

Again, I apologize, and I’ll write more as soon as it’s fixed.

- Stefan

Arq 1.3.14 is out!


May 13th, 2010

This release adds support for the Asia Pacific S3 bucket region “ap-southeast-1″ and fixes a number of bugs, including excessive memory usage and occasional temporary not-found errors on restore.

Feature Additions

  • “ap-southeast-1″ bucket region support.

Bug Fixes

  • Fixed an issue where changes to folders on remote volumes sometimes weren’t detected.
  • Fixed the frantic behavior on agent startup when a folder is missing.
  • Fixed the frantic behavior on agent startup when the 30-day trial is over and Arq doesn’t have a valid license yet.
  • Allow 0 for a budget number. If budget is 0 (or any number less than the minimum space required for 1 backup of each folder), Arq keeps just 1 backup for each folder.
  • Show correct pricing numbers in budget preferences, using pricing of selected bucket region.
  • Fixed long-term memory usage issues in Arq Agent.
  • Log the error code and description when SecKeychainItemCreateFromContent fails (rare).
  • Fixed an issue that was causing occasional temporary “not found” errors on restore: When Arq backs up, it stores small files in “packs”. When a pack reaches 10MB, Arq saves it to S3. When it’s done backing up it saves the last pack in S3 too. The next time it backs up, it starts with that last pack and adds to it until it reaches 10MB, at which point it replaces that last pack with the new full-size pack. The restore process was trying to read from the pack that the backup process deleted (replaced with a different pack). If you restarted Arq and tried restoring again, it found the new pack and worked fine.

Pick “Check for Updates” from the Arq menu to automatically update to 1.3.14, or download it from the web.