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superSimpleMCBackup
A very simple Minecraft server backup script. Intended to be a very basic tool. Heavily commented to help in use as a learning tool or reference.
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sanoid
These are policy-driven snapshot management and replication tools which use OpenZFS for underlying next-gen storage. (Btrfs support plans are shelved unless and until btrfs becomes reliable.)
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InfluxDB
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You can find my script here (I didn't want to make this comment *too* bloated): https://github.com/entropiccode/superSimpleMCBackup
I tend to use ZFS on my servers, including the minecraft server I run. So a backup is as simple as a ZFS send. I use sanoid+syncoid to make checkpoints and sync the filesystems to my home computer, and to a spare hard drive in the server. ZFS send is really nice since it doesn't have to scan the filesystem to find what is changed to backups. It keeps track of changed blocks between checkpoints and send will just transfer the changes.
I have also used borg in the past. It will be slower but can also work.