[Feature] Incremental Backups

[arvitus]

Hi, I really like the idea of having incremental backups to save storage space. If you run e.g. a Minecraft server, they can get quite big and incremental backups would really save a ton of disk space there.

I would suggest implementing it in the form of basically two types of backups that you can choose from when creating a backup:

1. Full backup: like before
2. Incremental Backup: incrementing from the latest backup with the latest full backup as base

This way you could have a schedule to make full backups like every week and every day you make an incremental backup. Maybe this can also be a permission on panel level, as well as server (user) level.

I think a lot of users would love this, especially for servers that can get quite large. And it's also a big selling point imho.

Now, I know this is a big request and there is probably a lot that I didn't think of, so I don't expect this to be added soon. But maybe that's something for after the initial release :)

[leumasme]

I think full-file based incremental backups (store any file that changed its hash since last backup) could get most of the benefit with potentially way less complexity than actual file content diffing incremental backups.
Main game files (executables/mods) are usually immutable, and worlds are often chunked into multiple files, so fully unchanged files likely account for a very large majority of the files in any backup.