Is paper wallet simply writing down your private key or printing it on a paper and keeping it safe. Is there anything else you need apart from that as a backup? thanks
Private key is enough. I typically use the following procedure when dealing with JBOK (=non-deterministic) wallet
(1) Disconnect the computer from internet.
(2) Generate several different addresses and add labels to all them, for example: Airdrop Address, GPU Mining Address, Change Address #1 ... Change Address #N, Standard Address #1 ... Standard Address #N
(3) Use dumpprivkey command to dump private key for all of those addresses.
(4) Safe private keys and corresponding addresses and their labels to one Libre Office document. I typically use following template
Application:
Label:
Address:
Private Key:
(5) Clear the console windows.
(6) Print the .odt file as many times as necessary
(7) Erase .odt file with Eraser => Eraser overwrites the file on the harddrive several times with random data, so it's no longer possible to recover it (doesn't work on SSD and flash drive though)