flux

Too bad, would’ve considered it as a viable option to mdadm + BTRFS.

Currently I'm using bcachefs with LVM (which can do raid, but I currently only have one NVME SSD), though it indeed does have RAID1/0/10 support. But overall I expect it not to not make the same silly default choices as btrfs, such as not being able to start the system if a RAID1 component of your root filesystem is missing. And, supposedly, when the RAID5/6 becomes stable, it won't have the write hole problem.

It said the code base was build on something stable, but it didn’t say what, do you happen to know what FS this project is a fork of?

It's based on bcache :) by the same author, but of course bcache is not really a file system but rather some kind of object storage layer for the purpose of caching slower block devices and absorbing write load.

Bcachefs might be coming soon to the mainline kernel, so that's going to make it a lot easier to try out. Personally however I have lost one bcachefs (that FS was readable, though, and I have good backups), but I have also lost a btrfs before and seen reiserfs bugs, so I don't too heavily count it against it; overall I enjoy its stability when using basic functionality. I haven't dared trying snapshots with it yet..

Depends on how much you change per time unit.

I take full system backups every three hours, but the backups are thinned so that there are previous 24 hourly ones, previous n daily ones, previous m monthly ones, etc. Similar approach can be used with snapshots.

I don't currently use snapshots—I don't run btrfs anymore—but when I did, I did a snapshot every hour and kept them for 24 hours. But then I backed up the latest snapshot, which gives consistent backups, versus regular backups where files can change while you're doing them. I'm nowadays using bcachefs, but I don't quite trust its snapshots yet so I haven't started using them ;).

Kopia has served me great. I back up to my local Ceph S3 storage and then keep a second clone of that on a raid.

Kopiahas good performance and miltiple hosts can back up tp it concurrently while preserving deduplication -- unlike borgbackup.

You will reconsider calling strategy a backup should the filesystem get corrupted for whatever reason.

I've tested my full system backup restore once with btrfs. Worked out fine.

It's similar, but you get to choose a selected subset of subreddits—subscribed or not—and view only the contents of those. It's used to combine subreddits of the same theme into one list.