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Signal Secure Backups

signal.org

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Re: Signal Secure Backups

#242
post #175

Earlier quoted context omitted.

Encrypted backups can't be deduplicated unless the encryption is flawed. There shouldn't be a way to tell that one Signal backup is somewhat related to another, unless you have the passphrase. That also means that Syncthing can't do better than sending the full backup. But if you're syncing via wifi (e.g. at home) it's not really a problem anyway.

> Encrypted backups can't be deduplicated unless the encryption is flawed This isn't an encryption problem; each device can only have one instance of Signal installed, and the latest backup (assuming it has terminated successfully) is a superset of the previous ones (aside from any messages that have dropped from retention, which you presumably don't want to be preserving, by definition). "Deduplicate" in this contex…

Signal has always between one and two backups, it removes the old ones.

Re: Signal Secure Backups

#244

Earlier quoted context omitted.

> It would be really useful to have more client-side control over media storage. That way, I could better manage storage growth without wiping entire threads. > For example, being able to see all media across chats, sort by file size, and optionally group by conversation would make it much easier to clean things up. I have good news for you: this already exists. On Android: Settings >> Data and Storage >> Manage Stor…

On my Samsung: Settings >> Device Care >> Storage

Does that give you per-attachment insight?

Re: Signal Secure Backups

#245
post #238
post #128

@Signal devs: any reason that the only two options for backup are now "locally" (flexible, but only solves for some use-cases) or "to Signal's special servers" ( not flexible; might be legally impossible for many users to enable)? Because it seems to me that, for much of Signal's (often paranoid) audience, they'd much rather use one of the backup/sync providers they've already verified trust of, than have to addition…

I'm confused, what's stopping you from using one of the backup services you already have on the file after it's done? Since Signal would backup to a file in your phone? Couldn't you just point your service to it and automatically sync every day for example?

Well, just to be clear, signal for iOS did not support ANY backup before this.

Re: Signal Secure Backups

#247
post #212

> alongside features that let you transfer your encrypted message history between Android, iOS, and Desktop devices. That's actually the feature I've been looking forward to. As I moved vom Android to iOS, I lost _all_ message histories from all messenger apps that use E2EE (Signal, WhatsApp, Threema, etc). The only one that "just worked" was Telegram due to not being encrypted. WhatsApp had a migration app that has…

doesn't signal also have a transfer to other device flow now?

Re: Signal Secure Backups

#248
post #48

Backing up Signal on Android for free and offline was ~always possible. The app creates a multi GB backup file on the phone memory under the Signal folder that you can just copy out and back on a new phone. The file is encrypted with the passcode and the database can be extracted. https://github.com/bepaald/signalbackup-tools

There are a couple of problems with the existing backup: 1. It is non-incremental. This means you'll need about as much free space on your phone as your Signal database takes, and it may take many hours to make if your database is large (mine is 18GB). I used to wake up to find my phone had not even fully charged because it had been so busy writing Signal backups. 2. Once you have it on disk, how do you get it away f…

at least on android: you use a good old usb-c cable.

Re: Signal Secure Backups

#249
post #247
post #212

> alongside features that let you transfer your encrypted message history between Android, iOS, and Desktop devices. That's actually the feature I've been looking forward to. As I moved vom Android to iOS, I lost _all_ message histories from all messenger apps that use E2EE (Signal, WhatsApp, Threema, etc). The only one that "just worked" was Telegram due to not being encrypted. WhatsApp had a migration app that has…

doesn't signal also have a transfer to other device flow now?

They have it between two Android phones next to each other for years, but probably not Android to iOS
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