Any #compression experts here?

I compressed an archive of nearly identical files (snapshots of the list of my tabs) in two ways.

First, as .tar.zstd, and that gave me 325MiB.

Then, I used #7zip with #lzma2, and got only 35MiB. Much closer to what I expected.

What gives? Is #tar stringing files together in a way that prevents #zstd from detecting duplicate data across files?

#mastoadmin The increase of backup sizes start to make me worried.

I'm the only user on my instance, and I follow 189 people.

No remote assets are added, just the #postgres db and assets of #mastodon . These files are compressed with maximum #7zip compression level, and have #lzma2 enabled #encryption .

Backups are not #incremental . I do full #backup of my #docker instance daily.

The instance runs at a 120gb ssd local server.

I'll keep on monitoring this, but this increase is absurd.