Explain Redis persistence mechanisms.

Redis offers two persistence options:

RDB (Redis Database Backup):

• Point-in-time snapshots
• Compact binary format
• Good for backups and disaster recovery
• Can lose data between snapshots

AOF (Append Only File):

• Logs every write operation
• Better durability (can be configured for every operation)
• Larger file size
• Slower restart times

# RDB configuration
SAVE 900 1      # Save if at least 1 key changed in 900 seconds
SAVE 300 10     # Save if at least 10 keys changed in 300 seconds

# AOF configuration
appendonly yes
appendfsync everysec  # Options: always, everysec, no