Subj : Re: Backup script tuning
To   : paulie420
From : MegaBrutal
Date : Sun Dec 18 2022 00:55:04

Hello,

Not sure if the question is still actual, but here are some quick notes:

1. Try to write POSIX compliant scripts those don't depend on Bash. Use
checkbashisms to check whether you are using any Bash-only features. Then you
can safely use the #!/bin/sh shebang. (Unless you really need some Bash
features, but then you should declare that your script requires Bash with the
#!/bin/bash shebang. Unlikely you'll need Bash for a backup script)

2. Use shellcheck to validate your code. It helps you point out gotchas you
might not think of.

3. This is just my taste, but for FS I need regular backups from, I'd prefer
to use BTRFS, then my script would make a snapshot of the subvolume and
transfer it to another disk via the btrfs send command. Not only it would be
more error-prone(as an entire subvolume would be transferred differentially
(in case you use -p to specify your previous snapshot to use as a base) which
either fails or succeeds, but you could save previous states of your files
snapshotted at specific points in time without using significantly more disk
space.

4. If I can't use BTRFS but need differential archives, I prefer to use DAR.

Ask if you want me to elaborate or anyone disapproves. ;)


~ MegaBrutal (new on this BBS)

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