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https://unix.stackexchange.com/questions/225730/how-to-take-snapshot-of-an-ext4-filesystem
1 Answer 1. The ext4 filesystem has no built-in snapshot feature. The generic way to make snapshots under Linux is at the level of the storage volume. Your filesystem must be on an LVM logical volume, which is Linux's own partition system, as opposed to directly on a platform-native disk partition.
https://www.linux.com/news/snapshots-support-ext4-file-system/
Jun 08, 2011 · Snapshots Support For EXT4 File-System. The Btrfs file-system has various "shiny" features like support for copy-on-write snapshots, cloning, transactions, sub-volumes, SSD optimizations, transparent LZO/Zlib compression, and many other advanced features by Linux file-system standards. The problem with Btrfs is that the next-generation file-system...Author: Phoronix
https://www.qnap.com/solution/qnap-ext4/en/
Although Btrfs supports snapshots, it cannot separate volumes for storing data and snapshot usage. Snapshot files will occupy system storage space, and that increases the difficulty of storage management and puts IT operations at risk.
https://www.phoronix.com/scan.php?page=news_item&px=OTU0Mg
Most Linux distributions continue using the EXT4 file-system by default, but now there may be snapshot support coming back to EXT4. Amir Goldstein at CTERA, a NAS device company, has been working on EXT4 snapshot support as they wish to have this feature for their network-attached storage units but aren't interested in yet deploying Btrfs for its copy-on-write snapshots.
https://serverfault.com/questions/481506/how-to-hot-backup-snapshot-an-ext4-partition-in-the-absence-of-lvm
How to hot backup/snapshot an ext4 partition (in the absence of LVM)? Ask Question ... Then you can make snapshots of the root fs (but have to do all the steps by hand with dmsetup; no black magic though). You just can't merge them back but that should not be a problem. ... An LVM snapshot of an ext4 fs does not seem very clean. 3. Linux live ...
https://www.qnap.com/solution/qnap-ext4/en-us/
Although Btrfs supports snapshots, it cannot separate volumes for storing data and snapshot usage. Snapshot files will occupy system storage space, and that increases the difficulty of storage management and puts IT operations at risk.
http://snapper.io/faq.html
Snapper does not require you to use special names for your configs. But here are some recommendations: The config for / should be called "root". Configs for home directories should be named "home_<username>". That way you can use pam_snapper with the default configuration.
https://www.reddit.com/r/synology/comments/680re7/does_btrfs_provide_significant_benefit_over_ext4/
BTFRS may offer some filesystem specific snapshot options though. It you are using all the same drive size, SHR/SHR-2 just becomes standard RAID-5 or Raid-6. Until DSM 6.x, Synology was using EXT4 so QNAP has the capability to choose a similar path if they want to migrate to BTFRS down the road via a …
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