Densar BK

Rebuild the PC, not just the files.

Name: Densar BK
Price: 59 EUR

Densar BK is a developer tool for Windows: an encrypted backup 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, your AI assistants' memory, 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, toolchains and AI assistant memory live.

Get Densar How it works

4.0.0New: disk cloning, partition manager and disk health

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 15 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 4.0.0, one file, 18.2 MB. Every classic backup is free, and so are restoring and disk health: you pay 59 euro once for BK Smart AI, disk cloning and the partition manager. 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 3663ef0be7d599d845e216c9fba9fba9f2c3881c991f86edb0378c84cda7408f

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.

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.

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.

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.

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.

Disks · new in 4.0.0

The new disk starts just like the old one.

Densar now works on whole disks too. Copy Windows onto a new disk, fit it in place of the old one and the PC starts as before, with your programs and files where they were. Next to it you will find a partition manager and a health check for your disks.

Clone system, from a 256 GB disk to a 1 TB one

Before256 GB

EFIR C: Windows Rec.

After1 TB

EFIR C: Windows, enlarged Rec.

C: takes all the extra space, and the boot setup is prepared on the new disk: fit it in place of the old one and Windows starts from there. It copies only the used part of the disk (byte for byte, if you want an identical copy), reads from a snapshot so Windows can stay on, and checks the file system at the end.

Clone disk with the licence

Three ways, pick the one you need. Clone system copies only what Windows needs to start, and fits a smaller disk too, as long as the data does. Clone disk copies the whole disk, every partition. Clone partition copies just one, wherever you want it.

Partition manager with the licence

Every disk with its drawing, its capacity and how full it is, and the partitions in a row at their real proportions. You create, resize, format and delete them, and change letter and name. The Windows partitions are protected: those cannot be formatted or deleted.

Disk health free

For every disk it tells you how it is doing: status, how much life is left, temperature, power-on hours and how much data has been written to it. It also reads many disks inside USB enclosures, and when an enclosure hides something, it tells you.

The disk Windows runs from never becomes the destination of a copy. And before writing, it asks you to confirm the right disk, with model, serial number and capacity in front of you.

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
Disk health

59 €

once. Not a subscription.

BK Smart AI, without limits
Rebuilding on a new PC: programs, links, dependencies
Disk cloning: the system, the whole disk or one partition
Partition manager
One year of updates included, the program stays yours forever
Personal licence: your PCs, no machine limit

Buy Densar, 59 euro

The button takes you straight to the payment: sign in with Google, pay once (the checkout is Polar's), and the licence turns on in the program with the same email.

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.