Densar BK Densar BK

Rebuild the PC, not just the files.

Densar BK is an encrypted backup system for entire working setups, not for folders. A backup program copies files; putting the setup back together on the other side is a different job. Densar takes the folder links, the credentials, the programs your project needs and the dependencies to reinstall, and rebuilds all of it on the new PC.

Built for developers, freelancers and technical teams: the machines where junctions, .env files and toolchains live.

Get Densar How it works
Windows Always encrypted Open format, no lock-in Leaves nothing behind on your disk Never phones home
Get it

One file. It installs itself, if you want it to.

Densar is a single .exe, around 11 MB. Run it and it asks whether you want to keep it portable, on a USB stick if you like, or install it. Installing needs no administrator rights, and uninstalling is in the Windows list like any other program.

Download Densar for Windows

Or download Densar from the direct link

Version 1.1.1, one file, 13.4 MB. Every classic backup is free, and so is restoring: you pay 39 euro once, only to create a BK Smart AI. You can see what it would take from your disk before deciding, without an account.

Windows will warn you, and here is why

Densar is not code-signed yet: a certificate costs a few hundred euro a year, and we would rather pay for it with the first sales than with your price. So the first time, Windows shows a warning screen that can be red and look alarming: it is not a virus. To go ahead, click the small link under the message ("More info", or "More details"): only then does the "Run anyway" button appear. Below is the SHA256 of the file, so you can confirm it is exactly the one we published.

Your browser may stop the download too, saying it is suspicious. It is not a virus alert and nothing was found in the file: Chrome blocks programs the world has not seen yet, and ours came out days ago. To keep it, open your downloads list and choose to keep the file. Then check the fingerprint below against the one you downloaded: you do not have to take our word for it, and neither should you.

SHA256 ef9595fd1525483e8b27363746373a326cf19c742ff98ad38ec07fe24fe275b0

Densar is for Windows. Do you want it for Mac?

Leave your email: we will tell you when it arrives. We are honest about it, so you can decide: the engine is deeply tied to Windows, so a Mac version is a real piece of work. When we reach a sensible number of requests, we will build it and release it. Every email is a vote.

Your email is used for this one notice and nothing else. No newsletter, no third parties.

How it works

Four steps, and the machine is working again.

The difference is not in the copy. It is in what happens on the other side.

01
It looks, and it understands
It reads your folders and works out what actually matters: what git does not have, folder links, credentials, the assistant's memory, and which caches are not worth carrying.
02
One encrypted archive
Disk to archive in a single stream: not one byte is ever written in the clear, not even for a second. Next to it, a plain guide you can read without the program.
03
On the new PC, one file
You carry the archive and Densar. It checks the archive is whole before writing a single file: a restore that stops halfway is worse than one that fails.
04
It rebuilds the machine
Folder links recreated and remapped, the assistant's memory under the new user, the programs installed, and the exact steps left to run the project.
Why it is different

"The files are there" is not the same as "it works".

A classic backup measures itself on files copied, Densar on a workflow that runs again. They are different yardsticks.

Folder links are not folders
Windows junctions get walked through by naive copies and turned into duplicates that drift apart silently. Densar recreates them, and remaps them to where things ended up.
Secrets always travel
Config files, tokens, account data: no switch you can flip is allowed to leave them out. If you lose the PC, that is exactly what has to be in there.
It tells you what is still missing
Files back does not mean project running. Densar checks the disk and says it plainly: this folder needs its packages installed, this one needs its first build.
You see it before it writes
What would be overwritten, and what would disappear, is on screen before anything is touched. The button that writes only appears afterwards.
Measured, not claimed

Most of a disk is not worth carrying.

Real numbers from a real workspace with six projects in it. Build caches are not lost data: they come back on their own, and carrying them would actually do harm, because they have absolute paths written inside and come back broken on another PC.

A typical workflow, as an example

0,38 GBactually archived
21,73 GBcaches skipped, on purpose
3007files moved to a new PC, with every git repository intact and no tracked file missing
Five kinds of backup

One of them is not like the others.

BK Smart AI paid
The one that understands. It chooses what matters, it always encrypts, and on the other side it rebuilds the machine instead of just unpacking it.
BK Mirror free
An identical, uncompressed copy you open with Explorer without Densar. Fast, and it mirrors deletions too: that is why it always shows you what would disappear first.
BK Full free
Your folders as they are, in one archive. With a password it is encrypted; without one it is a real .tar.gz that 7-Zip opens.
BK Differential · BK Incremental free
Only what changed. Each archive carries the index of the whole chain, so the chain describes itself: if a link is missing, the restore refuses to start rather than leaving you half a project.
Price

Your data is never what you pay for.

Backups are free, all of them, with no limits. What costs money is the machine that goes back to work.

Free
forever, no account needed
  • BK Mirror, Full, Differential, Incremental
  • Unlimited backups, unlimited size
  • Open your archives and get your files back
  • See what BK Smart AI would take from your disk, without an account
39 €
once. Not a subscription.
  • BK Smart AI, without limits
  • Rebuilding on a new PC: programs, links, dependencies
  • One year of updates included, the program stays yours forever
  • Personal licence: your PCs, no machine limit

Restoring is never something you pay for: an archive you already made goes back in place without a licence, without an account and without a connection, which is the situation where it actually matters. And the free kinds produce open formats that do not need us: a mirror is a folder Explorer opens, an archive without a password is a .tar.gz. Nobody is ever locked out of their own data.

A backup is judged on the day you need it.

Densar BK, a Chrononyte product.

Get Densar