They need to add some free way to backup to my own server. I have my own raid array with backups sitting in my basement. I'll back up to that. I do not want to pay them for cloud storage.

Right now, theoretically, I can do this by backing up to my phone and then copying the file over. But, this has many issues. Firstly, it is manual, so it will happen way less. Secondly, it is not differential, so the storage requirements will explode. Thirdly, if my signal message archive is bigger than the free space on my phone (especially if it takes more than 50% of total space) then I'm just fucked — there's no way to back it up anywhere else. Fourthly, the backup system is EXTREMELY buggy, to the point that it takes me HOURS babysitting it every time I make a backup.

A good solution would be let me put FTP/FTPS/SFTP/SCP/WebDav/SMB/etc. credentials in the Signal app and have it do periodic differential backups to there. Let me decide if I want it to be encrypted or not based on my threat model. Tell my contacts if this is enabled and let me exclude and/or encrypt specific chats if you want to let other people apply their security model too.

Only supporting any reasonable (meaning automatic and convenient) backup system with their paid cloud and not supporting my own server smells like a money grab to me. This is utterly unacceptable in a supposedly non-profit app. I have no problem with their paid cloud being an option, to be clear.

Another problem with Signal is that they only provide an official Linux package for Debian-based distributions. This forces people using other distributions to either do repeated manual effort to pull it out of their .deb files or build it themself (which is made way harder than it should be), or rely on sketchy third parties for packags. Given how much privatea information goes over Signal, such third party packages are an extremely tempting target for anyone from criminals to national spy agencies. This lapse in security due to not packaging for any Linux except Debian-based Linux (or even providing an ideally auto-updating portable binary!) is a much larger security lapse than letting me backup to my own server conveniently. So, their cries of security concerns relating to backups ring hollow.

Overall, it's quite a shitty app. I only use it because the alternatives are worse.

I agree.

> Right now, theoretically, I can do this by backing up to my phone

You don't have this option on iOS right now.