Data Directory Files

Files within the zcashd data directory (~/.zcash/) on Linux unless otherwise specified) include:

File	Description
zcash.conf	contains configuration settings for zcashd
zcashd.pid	stores the process id of zcashd while running
blocks/blk000*.dat	block data (custom, 128 MiB per file)
blocks/rev000*.dat	block undo data (custom)
blocks/index/*	block index (LevelDB)
chainstate/*	block chain state database (LevelDB)
database/*	BDB database environment
db.log	wallet database log file
debug.log	contains debug information and general logging generated by zcashd
fee_estimates.dat	stores statistics used to estimate minimum transaction fees and priorities required for confirmation
peers.dat	peer IP address database (custom format)
wallet.dat	personal wallet (BDB) with keys and transactions (keep private, back this up!)
.cookie	session RPC authentication cookie (written at start when cookie authentication is used, deleted on shutdown)
.lock	data directory lock file (empty)
testnet3/*	contains testnet versions of these files, except zcash.conf, if running -testnet
onion_private_key	cached Tor hidden service private key for -listenonion