Support for normal `.zip` compression

Hey, it would be really awesome if there was a way of creating .zip backups. Currently I use the default gzip configuration, and when trying to open the .tgz archive using 7zip there is a weird folder structure inside and I am not sure if this is supposed to look like this:

[backup-20251225-205201.tgz]
 '- [backup-20251225-205201.tar]
     '- [.] (Just a folder called ".")
         |- [<...>]
         '- [<...>] (all the files from the backup)

It would be really nice if I could just specify BACKUP_METHOD='zip' and this would create .zip backups.

Thanks.