[dnanian]

The space in the container is shared, so the size can grow and shrink as needed. You can, of course, set a quota or minimum.

As I indicated in the blog post about the new snapshot capabilities, we can't control the number of snapshots that are retained, nor their overall lifespan. So, no: continue to use Time Machine as well.

It's important, in my opinion, to use both different backup destinations (separate drives, online, etc) as well as different programs (e.g. us, Time Machine, Backblaze, etc). That way, you protect yourself against hardware issues, corruption, and even mistakes that one application might make. After all everything has bugs - but by having some redundancy in application, you can help to protect yourself against that too.

I certainly practice what I preach here, and use all three across a lot of media.