How to implement incremental differential backup with powershell and 7zip

Question

only recently I discovered how powerfull 7zip is and because I could not find any comprehensive example of backup script I decided to implement my own to help me understand 7zip little bit deeper.

Here is my code so far: https://gist.github.com/johnymachine/842af62fca4e6bb6fd0616174b135e27

I would like to implement differential backup (chaining the backup files) I found some great help here: https://superuser.com/questions/544336/incremental-backup-with-7zip

• So decremental mode should be fairly simple, create step to past and then update full backup like this: https://superuser.com/a/1121482/696441

• Any idea if it is possible to implement incremental mode so that increments build on top of each other intead of their last full backup?

Something like this full->incremental1->incremental2 and not like full->incremental1 and full->incremental2 .

In Veeam terminology it is forward incremental backup: https://helpcenter.veeam.com/docs/backup/hyperv/forward_incremental_backup.html?ver=100

Any ideas?

Answer 1

only recently I discovered how powerfull 7zip is and because I could not find any comprehensive example of backup script I decided to implement my own to help me understand 7zip little bit deeper.

Here is my code so far: https://gist.github.com/johnymachine/842af62fca4e6bb6fd0616174b135e27

I would like to implement differential backup (chaining the backup files) I found some great help here: https://superuser.com/questions/544336/incremental-backup-with-7zip

• So decremental mode should be fairly simple, create step to past and then update full backup like this: https://superuser.com/a/1121482/696441

• Any idea if it is possible to implement incremental mode so that increments build on top of each other intead of their last full backup?

Something like this full->incremental1->incremental2 and not like full->incremental1 and full->incremental2 .

In Veeam terminology it is forward incremental backup: https://helpcenter.veeam.com/docs/backup/hyperv/forward_incremental_backup.html?ver=100

Any ideas?