How to resume securely and reliably process of copying file
$A into backup location
$B done with
pv "$A" > "$B" or
cat "$A" > "$B" ?
(let's assume file
$A is very big, e.g. LVM2 snapshot file)
Is it achievable with
Preffered: bash or python (preferably python3) solutions.
pv "$A" > "$B" interrupted after copying 90%. How to resume it, in order to finish copying process but not repeating whole work again ?