How to backup a folder, encrypt and split on volumes

Pack, encrypt and split by 4Gb files

tar -zcvf - stuff | 
gpg -c --batch --passphrase '<password>' - | 
split -b 4G - "stuff.tar.gz.gpg.part"

Merge, decrypt and unpack

cat stuff.tar.gz.gpg.part* | 
gpg --decrypt --batch --passphrase '<password>' - | 
tar -zxvf -

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