Complete back up of existing installation

Hi Gurus
I need to completely reload the OS, Ubuntu 22 on a arm64 Odroid N2+,
will a backup from lovelace back up everything, or would I be better to
make a tarball of /src and .homeassistant/ in my home directory.
Thanks

FULL backup gets everything. There are multiple types of backup.

The backup is platform agnostic and can be restored to any platform HA supports. But no harm on making multiple copies.

The important part is test your backup on occasion (open the tar balls and make sure they are readable) a lot of folks were suprised last week restoring appdaemon or Node-Red and found they had corrupt backups for knee reason or another.

Don’t assume your backup is good just because it exists.

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Many thanks