Let's say I have a 4 GB file abc on my local computer. I have uploaded it to a distant server via SFTP, it took a few hours.

Now I have slightly modified the file (probably 50 MB maximum, but not consecutive bytes in this file) locally, and saved it into abc2. I also kept the original file abc on my local computer.

How to compute a binary diff of abc and abc2?

Applications:

• I can only send a patch file (probably max 100MB) to the distant server, instead of reuploading the whole abc2file (it would take a few hours again!)

• Locally, instead of wasting 8 GB to backup both abc and abc2, I could save only abc + patch, so it would take < 4100 MB only.

How to do this?

PS: for text, I know diff, but here I'm looking for something that could work for any raw binary format, it could be zip files or executables or even other types of file.

PS2: If possible, I don't want to use rsync ; I know it can replicate changes between 2 computers in an efficient way (not resending data that has not changed), but here I really want to have a patch file, that is reproducible later if I have both abc and patch.

Let's say I have a 4 GB file abc on my local computer. I have uploaded it to a distant server via SFTP, it took a few hours.

Now I have slightly modified the file (probably 50 MB maximum, but not consecutive bytes in this file) locally, and saved it into abc2. I also kept the original file abc on my local computer.

How to compute a binary diff of abc and abc2?

Applications:

• I could only send a patch file (probably max 100MB) to the distant server, instead of reuploading the whole abc2 file (it would take a few hours again!), and recreate abc2 on the distant server from abc and patch only.

• Locally, instead of wasting 8 GB to backup both abc and abc2, I could save only abc + patch, so it would take < 4100 MB only.

How to do this?

PS: for text, I know diff, but here I'm looking for something that could work for any raw binary format, it could be zip files or executables or even other types of file.

PS2: If possible, I don't want to use rsync ; I know it can replicate changes between 2 computers in an efficient way (not resending data that has not changed), but here I really want to have a patch file, that is reproducible later if I have both abc and patch.

Let's say I have a 4 GB file abc on my local computer. I have uploaded it to a distant server via SFTP, it took a few hours.

Now I have slightly modified the file (probably 50 MB maximum, but not consecutive bytes in this file) locally, and saved it into abc2. I also kept the original file abc on my local computer.

How to compute a binary diff of abc and abc2?

Applications:

• I can only send a patch file (probably max 100MB) to the distant server, instead of reuploading the whole abc2file (it would take a few hours again!)

• Locally, instead of wasting 8 GB to backup both abc and abc2, I could save only abc + patch, so it would take < 4100 MB only.

How to do this?

PS: for text, I know diff, but here I'm looking for something that could work for any raw binary format, it could be zip files or executables or even other types of file.

PS2: I don't want to use rsync ; I know it can replicate changes between 2 computers in an efficient way (not resending data that has not changed), but here I really want to have a patch file, that is reproducible later if I have both abc and patch.

Let's say I have a 4 GB file abc on my local computer. I have uploaded it to a distant server via SFTP, it took a few hours.

Now I have slightly modified the file (probably 50 MB maximum, but not consecutive bytes in this file) locally, and saved it into abc2. I also kept the original file abc on my local computer.

How to compute a binary diff of abc and abc2?

Applications:

• I can only send a patch file (probably max 100MB) to the distant server, instead of reuploading the whole abc2file (it would take a few hours again!)

• Locally, instead of wasting 8 GB to backup both abc and abc2, I could save only abc + patch, so it would take < 4100 MB only.

How to do this?

PS: for text, I know diff, but here I'm looking for something that could work for any raw binary format, it could be zip files or executables or even other types of file.

PS2: If possible, I don't want to use rsync ; I know it can replicate changes between 2 computers in an efficient way (not resending data that has not changed), but here I really want to have a patch file, that is reproducible later if I have both abc and patch.