Good idea. One more thing worth including in such a wiki post is that after restoring the /dev/sda79 backup it is sometimes not possible to add new fingerprints without doing the following. The existing fingerprints work OK, but if one wants to add new ones it takes wiping them and the cache first, as suggested by @ric9k here:
systemctl stop sailfish-fpd
/usr/libexec/sailfish-fpd/fpslave --remove-all
/usr/libexec/sailfish-fpd/fpslave --flush-cache
systemctl start sailfish-fpd
and then it works as usual. I’ve tested it multiple times after each restore and it always works, so there’s nothing to be worried about, just an additional easy step to do after restore.
This is regardless of underlying Android OS version, binaries version, etc.