Backup config folder ? Config Symlink ? DeDup? Ghost of excluded data ? File Histroy and Change Track ? Checking backups?

Support
21

Yes it does. I am not sure though if all (extended attr??). Might be OS dependent - you have to search docs/forum/github for answer or test:)

22

Which type is Kopia ? - Snapshots or Forever Incremental or Synthetic Full Backup or Chunking .

Why is it said that Snapshot are not backup

23

In a nutshell kopia works as follows:

This description is from another backup program (restic) but kopia works exactly the same.

24

Well, it’s called snapshot since it represents the state of the source at a given time or rather timeframe - which blurrs the snapshot idiom a bit, as a snapshot is usually regarded as an atomic operartion spanning the whole source, e.g. like in ZFS or BTRFS.

You can simply regard the snapshots in Kopia as (incremental) backups of your source(s), that would also be accurate.

25

How to exclude all excpet a folder

*.*
!/.BackupIgnore*
!/SubFolder_to_The_SisterFolder_To_IgnoreFile/Sub1/ <---- For folder
!/SubFolder_to_The_SisterFolder_To_IgnoreFile/Sub1/* <---- For content

This also save other folders without any content

Only folders are saved no content under Sub1/*