How private and secure is Backblaze B2?

I'm looking into getting an extra backup solution for my laptop, and a backup solution for my NAS/media server. Currently, my laptop backs up to my local NAS, and Proton Drive, while my server has no additional backup.

Is using something like Backblaze B2 actually private and secure, especially if I use the personal encryption key I can set? Or is there another online service that may be better and more private?

drwho ,
@drwho@beehaw.org avatar

If you encrypt your data before uploading it to B2 you should be fine. Unless you run it yourself on your own server, you can't be sure that your data will be unreadable by anyone poking around unless it's encrypted.

I've been using B2 for my offsite backups for a couple of years now (since 2018), and both Duplicity and Restic encrypt data before shipping it over. I wrote about it here.

sugar_in_your_tea ,

I figure I'll ask here instead of making a new post:

Does anyone know of any storage services that accept anonymous payment (cash, Monero, etc) and don't associate with an account? I'm willing to pay a premium since it would only be for a relatively small amount of data (mostly keys and whatnot). Bulk, uninteresting data would be encrypted and stored on a less expensive host like Backblaze or whatever.

randombullet ,

Find a trusted friend

Put a server with them

Encrypt en route and at rest.

sloppy_diffuser ,

https://kycnot.me/?t=&q=vps&xmr=on

sugar_in_your_tea ,

Cool, I haven't heard of this! Thanks!

delirious_owl ,
@delirious_owl@discuss.online avatar

Always encrypt client-sidr before upload

adonkeystomple ,

Would cryptomator work for that?

Atemu ,
@Atemu@lemmy.ml avatar

Cryptomator is made for that exact purpose.

Gargari ,

Use rclone crypt with any provider

ShadowCat ,

does encryption/decryption take time ?

Gargari ,

It's happening in background, you only see plain files and encrypted ones getting uploaded. It's seamless

calmluck9349 ,
@calmluck9349@infosec.pub avatar

This is what I am doing to offsite backup my files. B2 has great pricing!

MigratingtoLemmy ,

I asked a very similar question earlier and the consensus is to encrypt before you upload. That way you care more about reliability than privacy

sugar_in_your_tea ,

And make sure your encryption keys are stored securely. You don't want a house fire or something to destroy your keys and your data.

MigratingtoLemmy ,

Multiple pen-drives with encrypted storage holding keys; how does that sound? Good idea?

sugar_in_your_tea ,

As long as they're physically separated so you don't get screwed if there's a fire or something. And if you're DIY-ing, use multiple separate places (friends houses, work, etc).

Atemu ,
@Atemu@lemmy.ml avatar

Flash loses memory over many years. I'd use like 3 different mediums and always keep a hash of the key with the key.

Molecular0079 ,

What are good places to store your encryption keys? I am trying to find solutions that aren't just store a piece of paper in some security deposit box.

sugar_in_your_tea ,

Some options:

  • encrypted file stored on a free tier data storage (many are free for the first year)
  • Tarsnap - dedups so storage is cheap; for keys, this would be pennies per month
Molecular0079 ,

encrypted file stored on a free tier data storage (many are free for the first year)

I am confused, aren't you just pushing the problem further up the chain? Now you need to worry about storing the key that decrypts the file storing the key you wanted to protect in the first place.

Same goes with tarsnap, now you need to worry about where to store the tarsnap keys.

sugar_in_your_tea ,

You'd use a password to encrypt the keys and/or store that key in your password manager.

delirious_owl ,
@delirious_owl@discuss.online avatar

Make sure you test an actual restore. A backup that cannot be restored is useless.

MigratingtoLemmy ,

Absolutely. But this will likely just be media

lemann ,

I would suggest using any cloud storage provider with a third party client, that automatically encrypts your files before uploading them, ensuring the cloud provider does not have any kind of access to your keys.

I personally use gocryptfs then mirror that to B2, but IIRC rclone and some other third party alternatives have built-in pre-upload encryption options that are easier to setup and use

million ,
@million@lemmy.world avatar

I am using B2 now - I started using it before they added the encrypted buckets and am using restic to encrypt everything. It's nice because I don't really have to trust Blackblaze at this point aside from them not losing my data.

I've since additionally turned on encryption on my buckets, but as far as I know they store the key for you, so in terms of privacy it's not the best.

BlueBockser ,

+1 for restic. I've been using it for four years now and have never encountered an issue, including during my yearly restore practice run.

As far as B2 bucket encryption is concerned, I wouldn't trust it as far as I can throw it. Quite honestly, it could just be a fancy checkbox on their website without any actual encryption, and we wouldn't be able to tell. Either way, a compromise of Backblaze would put your data at risk.

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