What about Snapshots in XFS?
I think, they added this years ago.
I lived BTRFS for snapshots, but had much problems on an external drive and multiple times data loss… a broken cable was the reason… but the drive wotked with ext4 much better than with btrfs…
And on a hybrid SSHD also btrfs is not the best idea, if you use snapshots (every hour for example eith cron). It makes the SSHD as slow as the HDD behind the SSD-cache…
ok. making snapshots with btrfs is also no backup-strategy (alone).
But sending the snapshot to an external drive or backup-store is a really good thing for making backups. Much faster than doing this with rsync.
BTRFS-snapshots only is no backup-method. Only if you send them to an external Store (external HD, SAN, NAS…) In case of deduplication and Copy-On-Write, a snapshot is physically the same store-location as the original. Only the few changed parts of the whole filesystem are stored on another physical place on the same HD.
So if you use BTRFS-snapshots you MUST send/receive the snapshots to another medium, if you want to use snapshots as backup. Data-loss is so a big danger.
In BTRFS if you copy a File to another folder, only the reference is created. The physically information, what IS the file, is still the same.
If you use [code]cp --reflink=always[/code] for sure.
So if you make a Snapshot with BTRFS, it’s almost like a hardlink. The file disappears, when the last reference gets deleted. But al reference-files break, if the physically location on the HD breaks.
So… making a snapshot in btrfs is not a backup for me. It is a good way for a fast rollback. It is a good way for deduplication. It is a good way for daily work. But a real backup for me is a physically separated store for the information.
Make snapshots on a computer for fast rollback, or after system upgrade - even here for fast rollback. Or if I’m working on my photos, i do automatically every 10 minutes a snapshot. So a wrong command does only destroy the work of maximum 10 minutes… never the whole work.
But backup… i make differential snapshots and send them with btrfs send/receive to another drive, so the snapshot is pyhsically duplicated on a separate store. One HD can break… i have a backup.
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deleted by creator
What about Snapshots in XFS? I think, they added this years ago.
I lived BTRFS for snapshots, but had much problems on an external drive and multiple times data loss… a broken cable was the reason… but the drive wotked with ext4 much better than with btrfs…
And on a hybrid SSHD also btrfs is not the best idea, if you use snapshots (every hour for example eith cron). It makes the SSHD as slow as the HDD behind the SSD-cache…
deleted by creator
ok. making snapshots with btrfs is also no backup-strategy (alone). But sending the snapshot to an external drive or backup-store is a really good thing for making backups. Much faster than doing this with rsync.
deleted by creator
BTRFS-snapshots only is no backup-method. Only if you send them to an external Store (external HD, SAN, NAS…) In case of deduplication and Copy-On-Write, a snapshot is physically the same store-location as the original. Only the few changed parts of the whole filesystem are stored on another physical place on the same HD.
So if you use BTRFS-snapshots you MUST send/receive the snapshots to another medium, if you want to use snapshots as backup. Data-loss is so a big danger.
deleted by creator
deleted by creator
In BTRFS if you copy a File to another folder, only the reference is created. The physically information, what IS the file, is still the same. If you use [code]cp --reflink=always[/code] for sure.
So if you make a Snapshot with BTRFS, it’s almost like a hardlink. The file disappears, when the last reference gets deleted. But al reference-files break, if the physically location on the HD breaks.
So… making a snapshot in btrfs is not a backup for me. It is a good way for a fast rollback. It is a good way for deduplication. It is a good way for daily work. But a real backup for me is a physically separated store for the information.
Make snapshots on a computer for fast rollback, or after system upgrade - even here for fast rollback. Or if I’m working on my photos, i do automatically every 10 minutes a snapshot. So a wrong command does only destroy the work of maximum 10 minutes… never the whole work.
But backup… i make differential snapshots and send them with btrfs send/receive to another drive, so the snapshot is pyhsically duplicated on a separate store. One HD can break… i have a backup.
Do you understand, what i mean?