Back That Data Up
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Back That Data Up vs Time Machine
Time Machine is the best free backup Apple has ever shipped. Here is the honest picture of where it leaves gaps and what BTDU does differently.
| Back That Data Up | Time Machine | |
|---|---|---|
| Price | $29.99 one-time | Free (macOS built-in) |
| Ransomware detection | ✓ | ✕ |
| Cloud backup built in | ✓ | ✕ |
| Hardware key (FIDO/Yubikey) unlock | ✓ | ✕ |
| Snapshot independence | ✓ | ~ |
| Multiple jobs + custom schedules | ✓ | ✕ |
✓ yes · ~ partial · ✕ no. Prices may change; verify before deciding.
About Time Machine
The best free backup Apple has ever shipped
Time Machine is the best free Mac backup ever shipped, and for most Macs it is genuinely enough. It has been quietly protecting files since 2007. It ships on every Mac. It requires almost no configuration beyond pointing it at a drive. Apple built it into the operating system so it just runs, in the background, without you thinking about it.
Under the hood it is built well. Time Machine writes APFS snapshots to the destination volume and hardlinks files that have not changed, so each backup looks like a complete copy of your Mac without consuming the disk space of a full copy. That is the same approach BTDU uses. Apple spent years engineering that experience seamlessly, and it shows.
If you have one Mac, one backup drive sitting nearby, and you mainly want "I can get my files back if something goes wrong," Time Machine covers that job for free and without fuss. Keep it running. We mean that.
The gaps come at the edges: the threat landscape it was designed for in 2007, the drives it is designed to use, and the things it deliberately does not try to do.
The honest gaps
Where Time Machine leaves you on your own
Time Machine was designed for a much simpler threat model. In 2007 the concern was a failing hard drive. The solution was a second drive with copies. That logic still holds. The gaps show up around things that have changed since then.
Ransomware did not exist at scale in 2007. It does now. When ransomware encrypts your files, Time Machine keeps right on backing up. It has no way to tell the difference between a file you changed and a file that malware encrypted. By the time you notice the attack, the backup may have quietly overwritten the clean versions you would restore from.
APFS snapshot chains can corrupt. Time Machine stores its history as a chain of linked snapshots. When the chain develops a corrupt link, everything after that point becomes unreadable. A backup that shows up healthy in the sidebar for months can quietly become useless. You tend to find out the day you actually need it.
Local only by design. Time Machine stores everything on a local drive. That drive is usually sitting next to the Mac it backs up. One flood, one fire, one theft takes both at once. If you want an offsite copy, you are on your own: cloud services, a second drive offsite, or some manual rotation scheme. Time Machine has no cloud component and never has.
One job, one schedule, no hardware key. You can encrypt a Time Machine backup with a password. You cannot require a physical security key. You cannot run separate backup jobs on different schedules. You cannot tell it to back up Documents every hour and Downloads weekly. The defaults are the defaults.
Back That Data Up
Built for the gaps Time Machine leaves
BTDU is not a replacement for Time Machine on its own terms. It is built for the users who need more than Time Machine was designed to give.
Ransomware aware
BTDU watches every backup for the signs of mass encryption in progress and pauses before your clean snapshots can be overwritten. It works by monitoring the FSEvents stream for the rapid, uniform file change patterns ransomware produces. Time Machine watches for nothing: it faithfully copies whatever is on disk, encrypted payload included.
Hardware key unlock
BTDU supports unlocking your backup with a FIDO security key such as a Yubikey. No major Mac backup app does this. A password alone means anyone who gets the drive and the password gets your files. A hardware key means they also need the physical token. That is a different category of protection.
Snapshots that stand alone
Each BTDU snapshot is independently readable. Unchanged files are hardlinked for speed and efficiency, but each point in time snapshot does not depend on an unbroken chain. Time Machine stores its history as a chain of APFS snapshots. When that chain corrupts, everything after the break becomes unreadable. Backups that looked healthy for months can quietly go dark.
Your own cloud vault
Cloud Vault encrypts your files to Dropbox, Google Drive, iCloud Drive, or OneDrive in a format only your Mac can open. Time Machine has no cloud component at all. One fire or flood takes your Mac and your backup drive together. An offsite copy in your own cloud storage breaks that dependency without a monthly cloud subscription.
One more thing that does not fit neatly in a feature card: BTDU is sold as old school software. You pay once. Bug fixes and minor updates ship free for the life of the major version. There is no subscription to forget about, no renewal that doubles when you are not watching, and no account required to back up your own files to your own drive.
The app is signed and notarized by Apple, delivered with EdDSA signed updates via Sparkle, and runs entirely on your Mac. No servers hold your data. No telemetry phones home. Privacy by design: if the business model does not involve your data, there is no incentive to collect it.
The honest answer
Who should pick which
Stick with Time Machine if...
- → You have one Mac and a backup drive you point at it, and that arrangement satisfies you.
- → You do not store especially sensitive files that would be a problem in the wrong hands.
- → Your primary concern is "I can restore files if the drive fails" and ransomware is not a realistic threat for you.
- → Free is the right price point for the protection you need right now.
Time Machine is genuinely good at what it does. There is no shame in using it. We would rather you have a free backup running than no backup at all.
Consider BTDU if...
- → You work with files that ransomware would be catastrophic for: client work, legal documents, years of photos, source code.
- → You want a second copy offsite without paying a cloud service every month forever.
- → You want to lock your backup so that only a physical key in your hand can open it.
- → You want multiple jobs, custom schedules, or more control than Time Machine was designed to offer.
- → You want to pay once and be done with it.
A lot of BTDU users run both. Time Machine for the quick local restore, BTDU for the ransomware watch, the offsite cloud copy, and the hardware key lock. They are not competing for the same job.
If BTDU sounds like a fit for what you need, here is where to start. $29.99, one time. No subscription, ever.
Already running Time Machine? Good. BTDU installs alongside it without conflicts.