Online Backup

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Requires Mac OS X 10.10 ("Yosemite"), 10.9, 10.8 or 10.7
More info:  Arq Release Notes   Arq Manual
Arq 3.x available here

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Try our new product Filosync!

Back up your files. Keep control of your data.

  • Back up to your own Google Drive, Dropbox, AWS or SFTP account
  • Everything is encrypted before it leaves your computer

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Arq is super-easy online backup

Back up your files automatically, to your own cloud account, with Arq.

Just connect Arq to your own Google Drive account, Dropbox account, Amazon Web Services account, SFTP server, Greenqloud account, DreamObjects account, or any S3-compatible server.

Everything is encrypted before transfer, so your files are safe and secure.

Arq backs up your files automatically, every hour.

If you accidentally delete a file, you can go back in time and restore the file from your cloud backups.

Back up external hard drives, NAS files, whatever you want. Arq has no limits.

Try it for free for 30 days: Download

"After using Arq on flawlessly to back up two Macs over 2 to 3 years, I have never needed to restore files. Until today. Could be the Yosemite upgrade, who knows, but today I realized a folder of almost a GB of important writing and course resources had vanished. I simply found the Arq backup of last week, and promptly and easily restored the files, saving me weeks of literature searches. Arq works, as you have promised."
-- R. Navarro, University Professor

App Pricing

$39.99 per computer for Arq 4 (the app) Buy Now

Minor updates and bug fixes are free. Upgrade pricing is typically available after a major version upgrade, e.g. to Arq 5.

Storage Pricing

Backup to Google Drive:

15GB free storage with any Google account

1TB/user storage for $10/month with Google Drive for Work (1-4 users)

Unlimited storage for $10/month with Google Drive for Work (5+ users)

Backup to Dropbox:

2GB+ free storage with any Dropbox account

1TB storage for $9.99/month with Dropbox Pro

Backup to Amazon:

$.01/GB per month for backup to Amazon Glacier

Retrieving your files from Glacier takes 3-5 hours plus the download time.

Your initial backup will incur approximately $.05/GB in per-request fees. Subsequent backups will incur insignificant fees.

$.03/GB per month for backup to Amazon S3 (US East region)

No delay in retrieving files.

Per-request fees are typically insignificant.

Free Usage Tier: Up to 5GB free for 1 year

All recurring costs are billed to you by Amazon Web Services.

True privacy and control

Arq backs up your Mac to your own Amazon account, or SFTP server, or GreenQloud, DreamHost, Google.

Encrypt your backups with a password only you know. Haystack Software employees have no access to your data.

All encryption is done before your data leave your computer.

Your backups are stored in an open, documented format. We've also delivered an open-source command-line utility called arq_restore that's hosted at github, so you can read your data anytime without depending on Haystack Software (although we're in this for the long haul, so we'll be around for a long, long time!)

Awesome support

We believe backup is a critical function, so we strive to fix critical issues in Arq quickly. If you have questions or feedback, please email us at and we'll get back to you promptly. We strive to answer all emails within 1 business day.


Arq restores all your data and metadata correctly, unlike some other online backup offerings. Backup Bouncer is a test suite independently developed by Nathaniel Gray to verify the accuracy of backup products restoring Mac file data and metadata -- in his words, to "keep the ugly backup tools out of the club." We make sure Arq passes all Backup Bouncer tests.

Other Features

Wayback Machine

Arq keeps multiple "versions" of your files — a backup history. So if you discover a file was corrupted or accidentally deleted, you can go back and get it.

Arq automatically backs up every hour or every day, depending on the schedule you choose. Only the changes are uploaded for each backup, minimizing network and storage usage.

No limits

Arq backs up everything you tell it to back up:

  • It doesn't skip videos or ignore certain file types.
  • It backs up files of any size -- 4GB, 40GB, it doesn't matter.
  • It backs up your external drives and your network drives.
  • It doesn't delete backups of your external drives just because you haven't plugged them in lately.
  • It doesn't forcibly delete backups older than 4 weeks.

Perfect Complement to Time Machine

Time Machine works well and provides fast restore, but you have to remember to plug in your backup device (unless you have a Time Capsule), and it doesn't cover all scenarios:

  • theft of computer and backup device
  • backup while traveling (unless you bring your backup drive)

Arq backs up whenever/wherever there's an Internet connection.

Compression for Reduced Storage Costs

Arq compresses your data before uploading, reducing the amount of data uploaded.

Flexible Bandwidth Options

Arq can upload to S3 at maximum speed, or at a fixed transfer rate that you choose. Or choose automatic transfer rate to slow down uploads whenever you're using the Internet for other tasks.

The Story Behind Arq

I started thinking about Arq back in early 2009 because I wanted an easy-to-use backup program but couldn't find one that worked well. I liked Time Machine and even bought a Time Capsule so I wouldn't have to remember to plug in an external hard drive. But it still only backed up when I was at home near the Time Capsule, and if my house burned down or someone stole my computer and Time Capsule my stuff would be gone. I wanted online backup, at least for my most important documents and photos.

I tried Mozy, Carbonite and Backblaze. They all offered "unlimited" size backup for a fixed fee, but the "unlimited" service had limits. I couldn't back up a network drive, for example. I couldn't keep backups of external drives reliably -- Backblaze promised to delete backups of external drives that haven't been connected for 30 days. They were vague about durability and availability of my backups. And then there was the risk of the backup storage provider closing up shop and me losing all my backups. I'd seen that happen before (Upline, Xdrive, Omnidrive, Digital Railroad).

Amazon S3 seemed like a great place for my backup data. It's backed by the power of a large, profitable, public company. It offers clear durability and availability numbers and replication to multiple data centers. And it isn't an "unlimited" type of offering, so they don't add constraints to minimize the amount of backup data I have.

Backing up to S3 felt like real backup, but there wasn't any great software to do it.

I had been working on a project that used Amazon S3 for storage, and stored its stuff as a content-addressable storage (CAS) system, written in Java. I decided to rewrite those bits in Objective-C. Then I added logic to correctly back up all Mac-specific metadata, plus strong encryption, plus a simple but powerful Mac UI. Thus Arq was born.

It turns out lots of people were looking for something similar, and through word of mouth Arq has become very popular among Mac users. Now with the super-cheap Glacier storage option, Arq is set to grow even faster!

Screen Shots

Back up anything
Back up anything
Exclude files by name or path
Exclude files by name or path
Set S3 budget
Set maximum storage budget
Limit network impact
Limit network impact
Multiple versions
Versioned backups
Restore from other computers
Restore from your other computers

Recent Tweets about Arq

JustinMurphy @Google nearline + @arqbackup is a beautiful thing. Mar 17
Stammy "Google Cloud Storage Nearline seems just about perfect" - @arqbackup Mar 17
creativedutch @arqbackup is by far the best backup tool I've ever used. Love it. Mar 17
alphex ARQ from @arqbackup just added the super cheap and easy to use Google Nearline Storage. YES! Mar 17
esycat @arqbackup Thumbs up for adding Nearline support so promptly! Mar 16
azmd @arqbackup I'd kill a kitten for a Linux version of arq for my servers. Mar 16
mikestanley @arqbackup @cphaynes Buying Arq Backup today. What would you recommend for PC's/Small Servers at work? Mar 14
jmarhee @jmarhee Thank god for @arqbackup is all I have to say. XCode needs to be careful; it might wake up dead in an alley. Mar 13
mpirnat Was all stressed about moving source files for cloud backup from hard drive to NAS. Turns out it was utterly painless. Thanks, @arqbackup! Mar 07
maguay This is very cool: Arq can now backup to Dropbox. Combine with Selective Sync and it should be awesome. Feb 25
rmateu Arq Backs Up to Your @Dropbox Account This sounds like a great way to use all the empty space left. Feb 24
paulozoom Will likely cancel my @backblaze account and, instead, use @arqbackup to backup to the 1TB Dropbox Pro account. One less recurring bill. Feb 25
decisivetactics Arq backup tool for Mac now supports Dropbox. By far the best off-site backup solution for Mac users: @arqbackup Feb 24
bkonkle Just when I think I'm done, @arqbackup pulls me right back in! It will now back up to Dropbox, giving me another way to use that 1TB. :-) Feb 24
gfmorris Did I upgrade to @arqbackup 4.8 and start backing up my Air to Dropbox? Yes. It’s now backed up in six locations. #paranoid Feb 24
erichmenge @thomasfuchs reinstalling OS X is so easy I just use @arqbackup for the files I actually care about. @arqbackup is great. Feb 24
macstoriesnet Arq for Mac Adds Support for Dropbox Backups Feb 24
thomas_witt I can only praise @arqbackup … the BEST off-site backup solution. Besides @1Password and @littlesnitch the most important tool in my Mac. Feb 24
pslobo .@arqbackup gets better by the update. It can now backup to @Dropbox too, so you can take advantage of all that space a Pro account offers. Feb 24
levelsio .@arqbackup is like the best engineered backup app ever, super recommended, it works with Glacier, S3, Google <3 Feb 13
peelman @arqbackup you just made a lot of people very happy; and you stand to make a bunch more happy! Jan 29
RickCogley Mac users, @arqbackup is encrypted cloud backup for your files. Works with Google Drive, Amazon S3, SFTP, Greenqloud. Jan 29
yig Time Machine, inexplicably, stopped backing up many random directories months ago. @arqbackup saved me! Jan 28
wimleers @johan_ronsse @backblaze SuperDuper for local backups, together with @arqbackup + S3/Glacier for off-site/online back-ups. Jan 25
BrandonBT I love @arqbackup for backing up my Mac. Simple, cheap, incremental and encrypted backups to the cloud. Highly recommended. Jan 16
mmayo Reorganized my Pictures folder (~95GB) but via the magic of content-addressable-storage @arqbackup only had to update ~700MB in S3! Jan 12
louismarius Just got support above and beyond expected from Stefan at Haystack Software for the Arq program. Thanks! Jan 08
bgolub @ilyasu amazon glacier. I use Arq to backup my MacBook and NAS: It's by far the cheapest option I could find. Jan 05
xavez Finally found the backup programme I have been looking for: @arqbackup hooray! Jan 05
alphex @bdkjones great email to @backblaze . I use ARQ which uses your own Amazon S3 for remote backups, with encryption Dec 30
rmatta @jjudge in case you were looking for a decent S3, etc backup client, I use @arqbackup for it. Dec 29
nielskee Great backup solution, @arqbackup to @awscloud over @BTfibre. Peace of mind restored (like any data will be in case of emergency) Dec 28
itsphilhere I wholeheartedly recommend @arqbackup for backups from Macs. Passes the Mum and Dad test, brilliant software. Dec 25
leemunroe Using AWS Glacier as a backup solution is working out well so far. ~$1.60/mth for 150 GB. Using @arqbackup to manage the backups. Dec 20
wopr_system_one setup #mac backup with #arq @arqbackup to #s3 and #google #drive! two backups one app Dec 15
ole_b @mrgnrdrck besides that, @arqbackup with glacier is very recommended. Been using it for some time now with >100GB of photos in glacier. Dec 11
sdotsen Since switching to a Mac, I've found myself purchasing software. My best purchases thus far have been @arqbackup and @togetherapp Dec 08
nickstamas @joe_steele @mwhuss @arqbackup Arq is a beautiful product. Dec 02
resetbrian @arqbackup thanks for the follow-up. Lmk if you have any q's about the other reports I sent over yesterday. Your prompt support is great! Dec 01
cleverdevil Also, I am reminded about how awesome the combo of @arqbackup and @DreamHost DreamObjects is. No reason for alarm: my data is safe. Nov 29
zobskewed A year in and @arqbackup is a great app! Also, it's raining today as well :) Nov 26
alex_marchant OMG, Arq backup to S3 is so much faster than anything I’ve used, including backblaze Nov 24
signed8bit @marcoarment Another vote for @arqbackup from me. I’ve been super happy with it and run less than $3/month for 134 GB of glacier data. Nov 24
mjuarez @marcoarment I've been extremely happy with backups on S3/Glacier with @arqbackup. My own encryption keys, my own S3 bucket, full control. Nov 24
stevehuey Arq backup. Fantastic backup to AWS, Google Drive, SFTP and more. @arqbackup #RateFriday ⭐️⭐️⭐️⭐️⭐️ Nov 21
rupl I've tried three cloud backup solutions in the past year and @arqbackup is the winner by far. Great product! Nov 12
up2jj I must admit - @arqbackup has a first-class support. Response time is incredible. Nov 09
mccutchen When my laptop was stolen a few weeks ago, @arqbackup saved my ass. Perfect backup solution for those who want to control their own data. Nov 06
togume Installing @arqbackup + @awscloud Glacier. Doing RBAC IAM, but these guys make it beautifully simple. In love! Nov 03
tweetsethmiller @arqbackup is the best backup software for the Mac. It's saved me so many times. I tried every other solution incl. DIY. Arq is the best. Nov 02
jhaaren Just backed up my Mac to Amazon S3/Glacier with @arqbackup. Very much recommended software and method! Oct 29
marcedwards Thank you @Noodle_Hazel, @Dropbox, @1Password and @arqbackup for the Yosemite dark menubar support. Looks so pro. Oct 29
alanshutko Just picked up another @arqbackup license for dead-simple offsite backups on another Mac Oct 27
dclobato Segunda vez que eu preciso restaurar um backup. Segunda vez que o Time Machine me deixa na mo e o @arqbackup me salva! Oct 26
beala Taking @arqbackup for a spin and I'm impressed. Versioned and encrypted offsite backups for $0.01/GB on Amazon Glacier. Oct 25
dragonwoman Getting around to updating my backup strategy using @arqbackup. Know too many folks who have lost everything, recently, by failure or theft! Oct 19
ckarwoski @ccie5851 if you’re running a Mac, use @arqbackup to store to S3/Glacier. Oct 19
JonathanKannair Fantastic peace of mind, easy set up, great support! @arqbackup Using it with Glacier could not be simpler. Oct 14

Arq on Hacker News

Hacker News comments: March 4, 2014


"a terrific addition to an already excellent tool" - TUAW

"near-perfect low-cost off-site backup solution" - Webmonkey |

"I've read great things about Arq" - Marco Arment

"The deeper I dig, the more I wish I was a Mac user" - Steve Gibson , Security Now Episode 350

"einfach und genial die Datensicherung mit Amazon S3 über Arq" - Blog IT-Solutions

"Uploading and maintaining 50 gigabytes of data on Arq will cost about $5 a month" - New York Times

"My files get backed up to S3 using Arq" - Chris Wanstrath, GitHub co-founder

"I can vouch that it's a very effective system." - Brett Terpstra

"a better way to backup critical files online" -

"easiest to use, most flexible, and gives me the most control" - NoodleMac

"My favorite cloud backup tool" - Practically Efficient

"a fantastic backup utility" - AppStorm's Best Mac Software of 2010

"simple and elegant and works as expected" - Macgasm

"Arq makes it easy to retrieve your Mac's files." - Mac360

"If you’re serious about backups and like the idea (I do) of having your stuff on Amazon S3, go download Arq. It’s just great." - MacStories

"I love Dropbox for its elegance and simplicity, but actually those are exactly the qualities I like in Arq too." - AppStorm

"It’s exactly as simple as it can be, and it f***ing works perfectly." - Mason Mark

" kicks Jungledisk’s ass when it comes to speediness." - Snipe.Net

"powerful" - Full Creative

"I love it" - Trevor Turk

"Die technische Seite von Arq macht einen sehr sauberen und vielversprechenden Eindruck." - macfidelity

"Empfehlenswerte Mac-Datensicherung" - MacMacken

"phenomenal user experience" - OS X Attack

Haystack Software LLC